Following the introduction of the Glock 17, numerous variants and versions have been offered. Different model numbers identify variants that differ in caliber, frame, and slide length, except for a few models with a letter suffix (the Glock 17L, 19X, 30S, and 43X). The original double-stack "small frame" Glock pistols are made in five form factors, all modeled after the original full-sized Glock 17. "Standard" models are designed as full-sized duty firearms with a large magazine capacity. "Compact" models are slightly smaller with reduced magazine capacity and lighter weight while maintaining a usable grip length. "
Subcompact" models are designed for easier carry and being lighter and shorter, are intended to be used with two fingers on the grip below the trigger guard, and lack an accessory rail like the larger, after generation two, Glock models. The other two form factors use the full-size "standard" frame with longer slides that include a lower section to fill in the space between the frame's dust cover and the front of the slide. The first of these is the "long slide" models, which were too long for certain IPSC classes, necessitating the creation of the intermediate "competition" models. Currently, the available chamberings for all five form factors are 9mm Parabellum (9×21mm in certain countries) and .40 Smith & Wesson. Additionally, .357 SIG and .45 GAP chamberings are offered in "standard", "compact", and "subcompact" models, while .380 ACP is offered only in "compact" and "sub-compact" models. Recently, so-called "crossover" versions in 9mm Parabellum pair short (front-to-back) "compact" frames with longer "standard" grip lengths. This was initially intended to provide a longer-grip, higher-capacity version of the Glock 19 (Glock 19X and Glock 45). Still, Glock developed the Glock 47 for US Customs and Border Protection, which used the G45 frame with a G17-length slide that included a front section to fill the gap between the dust cover and the front of the slide, a design that maintains the same overall dimensions as the Glock 17. Naturally, the next step was to couple this slide with the Glock 19 Frame, creating the Glock 49. There are also the wider double-stack "large frame" Glock pistols for use with larger calibers, currently in
10mm Auto and .45 ACP. These models have bigger, wider slides and frames and are larger than the smaller-chambered pistols. These come in only "standard", "subcompact", "competition" (.45 ACP only), and "long slide" (10mm only). Additionally, Glock introduced the "subcompact" Glock 30S in .45 ACP, fitted with the Glock 36's slimmer, lighter slide. Also, in 2007, Glock introduced a "short frame" version of these large frame weapons to provide a grip better suited to small hands. The short frame was originally designed to compete in the now-canceled U.S. military
Joint Combat Pistol trials for a new .45 ACP pistol to replace the
M9 pistol. Glock's entry featured an optional ambidextrous magazine release and a
MIL-STD-1913 rail, along with a reduced backstrap. The Glock 21SF was originally available in three versions: one with a Picatinny rail and an ambidextrous magazine release, and two with a Universal Glock rail, available with or without the ambidextrous magazine release. However, the ambidextrous release and Picatinny rail were soon dropped. As of January 2009, the Glock 20, 21, 29, and 30 were offered in short-framed variations. These models incorporate a reduction in trigger reach, and full-sized models feature a reduction in heel depth, which corresponds to an overall reduction in length for those models. The short frame models were not introduced for the Gen 4 and Gen 5 models, as the replaceable backstraps design makes a separate short frame version redundant. Glock also produces single-stack "slimline" models, targeting the concealed carry market. The first was introduced with Gen 3 in .45 ACP as the Glock 36. More recently, after the introduction of Gen 5, came the Glock 42 in .380 ACP, followed by the Glock 43 in 9mm Parabellum. The most recent additions to the "slimline" series, the 43X and 48, were introduced together in 9mm Parabellum. These have longer grips that allow for a full three-finger hold and a 10-round capacity. The 43X is a long grip "crossover" 43, while the 48 has a longer slide to provide a "slimline" version of the "compact" Glock 19.
9×19mm Parabellum •
Glock 17: The Glock 17 is the original 9×19mm Parabellum model, with a standard magazine capacity of 17 rounds, introduced in 1982. Initial samples of the new civilian offering were marked Glock 82. But, it was decided not to use the year to designate civilian models, but to begin the model numbers at 17 and continue numerically from there. Glock also offers a version of the standard magazine that incorporates a longer "+2" base plate, increasing capacity to 19 rounds. Also, a 10-round version of the standard magazine was created for markets that restrict handgun magazine capacity. Glock also offers an extended 24-round (with flush base plate) magazine for the Glock 17. Finally, the Glock 17 can use the Glock 18's extended 33-round magazine (with a +2 base plate). The base plates for the
extended magazines can be swapped out to create 26- and 31-round magazines as well. The longest-serving of the Glocks, the Glock 17 can be had with numerous "options," such as a threaded barrel or slides cut for the Modular Optic System (MOS). Some options, such as the universal Glock rail, have become standard. In addition, some features have been given their own suffixed model designations, creating entirely new models, all of which can use the same magazines as the Glock 17: •
Glock 17L: Introduced in 1988, the 17L incorporates a longer slide and extended barrel. Initially, the Glock 17L had three holes in the top of the barrel and a corresponding slot in the slide; however, later production pistols lack these holes. The Glock 17L is manufactured in limited quantities. •
Glock 17C: Introduced in 1996, the 17C incorporates slots cut in the barrel and slide to
compensate for recoil. Many other Glock pistols now come with this option, all of which have a "C" suffix on the slide. •
Glock 17MB: The 17MB is a version with an ambidextrous magazine catch. This model, along with the other MB variants, was no longer available when the fourth-generation models introduced a reversible magazine catch. •
Glock 17M: Introduced in 2016, the 17M was created in response to an FBI solicitation for a new full-size 9mm pistol. Differences from the Generation 4 model include the removal of the finger grooves, an ambidextrous slide lock, a rounded slide nose profile, a flared magazine well with new magazine baseplates, and a tougher finish on metal components. The Glock 17M also abandons the polygonal rifling of previous models in favor of conventional rifling. , the
Federal Bureau of Investigation, the
South Carolina Highway Patrol and the
Ontario Provincial Police have adopted the pistol as standard. •
Glock P80: Introduced in 2020, the P80 was commissioned by United States firearms distributor Lipsey's to create an exclusive commemorative Glock model, the Pistole 80. The P80 is a throwback to the original Glock 17 Gen 1 type pistol chambered in 9×19mm with an original Gen 1 frame and stippling and Gen 2/Gen 3 internals. •
Glock 18: The Glock 18 is a
selective-fire variant of the Glock 17, developed at the request of the Austrian
counter-terrorist unit
EKO Cobra, and as a way to internally test Glock components under high-strain conditions. Originally produced in 1986, this
machine pistol–class firearm has a lever-type fire-control circular selector switch, installed on the serrated portion of the rear left side of the slide. With the selector lever in the bottom position, the pistol fires
fully automatically at a
cyclic rate of 1,100–1,400 RPM (rounds per minute), and with the selector lever in the top position, the pistol fires semi-automatically. The firearm is typically used with an extended 33-round-capacity magazine and may be fired with or without a shoulder stock, although other Glock 17 magazines with capacities of 10, 17, 19, or 24 rounds can be used. Unlike all Glock's other pistols, it is only offered to military, law enforcement, and government organizations. Early Glock 18 models were ported to reduce
muzzle rise during automatic fire. A very early design introduced a longer ported barrel, which was soon discarded as it would not fit in a holster. Another compensated variant was produced, known as the Glock 18C. It has a keyhole opening cut into the forward portion of the slide, similar to the opening on the Glock long-slide models, although the Glock 18 has a standard-length slide. The keyhole opening provides an area for the four progressively larger (from back to front) compensator cuts machined into the barrel to vent propellant gases upward, affording more control over the rapid-firing machine pistol. •
Glock 18C: The compensator cuts start about halfway back on the top of the barrel. The two rear cuts are narrower than the two front cuts. The slide is hollowed, or dished-out, in a rectangular pattern between the rear of the ejection port and the rear sight. The rate of fire in fully automatic mode is around 1,100–1,200 rounds per minute. Most other characteristics are equivalent to the Glock 17, although the slide, frame, and certain fire-control parts of the Glock 18 are not interchangeable with those of other Glock models. •
Glock 19: The Glock 19 is effectively a reduced-size Glock 17, called the "Compact" by the manufacturer. It was first produced in 1988, primarily for
military and
law enforcement. The Glock 19's barrel and pistol grip are shorter by about than the Glock 17, and it uses a magazine with a standard capacity of 15 rounds. A 10-round version of this magazine is also made for markets that restrict handgun magazine capacity. And, a "+2" base plate can make the standard magazine into a longer 17-round magazine. The pistol is also compatible with any magazines designed for the Glock 17 and Glock 18, providing factory magazine capacities of 17, 19, 24, and 33. Changing out base plates adds capacities of 26 or 31. To preserve the operational reliability of the short recoil system, the mass of the slide remains the same as in the Glock 17 from which it is derived. Except for the slide, frame, barrel, locking block, recoil spring, guide rod, and slide lock spring, all other components are interchangeable between models 17 and 19. The Glock 19 Gen 4 MOS (Modular Optic System) has also been used by Special Operations Forces as the
Mk 27 MOD 2. One of the oldest of the Glock pistols, options like threaded barrel and MOS slide cuts are available, and suffixed model designations have been created for some features, all of which, except for the G19X, can use any magazine the G19 can: for
XM17 Modular Handgun System competition •
Glock 19X: The 19X is the civilian version of Glock's entry to the
XM17 Modular Handgun System competition for the
United States Armed Forces. It features a Glock 19 slide with a Glock 17-like frame in coyote brown instead of the standard black. The frame includes a
lanyard loop and a front lip in the
magazine, whose purpose is to make changing magazines with gloves on easier, but this means the new Gen 5 17-round magazines cannot be used in the Glock 19X because the front lip will block the extended magazine floor plates from locking into the 19X's magazine well. This can be remedied by switching to a Gen 4–style magazine floor plate or with a factory +2 extension. The G19X can use any factory G17 magazine for Gen 4 and prior. It cannot accept only the Gen 5 17- and 19-round magazines. The 19X comes standard with
night sights and includes one 17-round magazine and two 19-round magazines, all in coyote color. The Glock 19X has proven to be one of Glock's best-selling pistols, with over 100,000 sold within 6 months of its release. •
Glock 19M: Introduced in 2016, the 19M was created in response to an
FBI solicitation for a new compact 9mm pistol. Differences from the Generation 4 model include the removal of the finger grooves, an ambidextrous slide stop, a rounded slide nose profile, a flared magazine well with new magazine baseplates, and a tougher finish on metal components. The Glock 19M also abandons the polygonal rifling of previous models in favor of conventional rifling. The US Marine Corps fielded the Glock 19M, designated as the M007, to CID (Criminal Investigation Division) and
Marine One personnel. •
Glock 19 Canadian: The limit for Restricted Class firearms in Canada is a 105mm barrel, so, due to its 102mm barrel, the standard Glock 19 is too short to be legal. Starting in 2017, a market-specific Glock 19 has been sold in Canada with a 106mm barrel and a distinctive laser-engraved hollow maple leaf on the right side of the slide. •
Glock 26: The Glock 26 is a 9×19mm "
subcompact" variant designed for
concealed carry and was introduced in 1995, mainly for the civilian market. Nicknamed the
Baby Glock, it has also been acquired by the
US military and designated
Mk 26. It features a smaller frame compared to the Glock 19, with a pistol grip that supports only two fingers, a shorter barrel and slide, and a double-stack magazine with a standard capacity of 10 rounds. A factory magazine with a +2 extension gives a capacity of 12 rounds. In addition, the Glock 26 can use factory magazines from the Glock 17, Glock 18, and Glock 19, and one can swap out base plates to give it capacities of 15, 17, 19, 24, 26, 31, and 33 rounds. More than simply a "shortened" Glock 19, the design of the subcompact Glock 26 required extensive rework of the frame, locking block, and dual-recoil-spring assembly. MOS options are available, but the Glock universal rail is not offered so far. There is also: •
Glock 26 for U.S. Customs and Border Protection (CBP): This Glock is a Generation 5 Glock for the CBP that incorporates a flared magazine well with an extended, longer grip than that of the usual Gen 5 Glock 26. Moreover, the magazine well is flat across and has no bump, like the Glock 25 Gen 5 or the G19X. In addition, it offers a longer 11-round magazine. •
Glock 34: The Glock 34 is a competition version of the Glock 17. It is similar to its predecessor, the Glock 17L, but with a slightly shorter slide and barrel, to meet the maximum size requirements for many sanctioned action pistol sporting events. It was developed and produced in 1998, and compared to the Glock 17, features a longer barrel and slide. It has an extended magazine release, extended slide stop lever, trigger pull, and an adjustable rear sight. The sides at the front of the slide are slanted instead of squared. Further, the top of the slide and parts of its inside are milled out, creating a conspicuous hole at the top designed to reduce front-end muzzle weight to better balance the pistol and reduce the overall weight of the slide. The Glock 34 can accept any magazine the Glock 17 can accept. •
Glock 43: The Glock 43 is a "slimline" version of the subcompact Glock 26 that features an ultracompact slide and frame. The Glock 43 is the first Glock pistol to be manufactured with a single-stack 9×19mm Parabellum magazine, which has a standard capacity of six rounds and is unique to the model. Unlike other subcompact Glock pistols, the Glock 43 cannot use factory magazines from its larger relatives due to its single-stack magazine design. It also does not allow removal of the backplate grip, as is possible on the 4th-gen Glocks. The magazine is thinner than the Glock 43X, and the Glock 43 cannot accept magazines for the Glock 43X. •
Glock 43X: The 43X is similar to the 43, except it has a longer, thicker grip for a 10-round magazine capacity. The grip of the Glock 43X is comparable to that of the 48 and can be interchanged. Glock 43X magazines do not fit into the Glock 43, or vice versa. The 43X also features front slide serrations, a built-in extended beaver tail, a reversible magazine catch (similar to Gen 5 models), GMB rifling (again similar to Gen 5 models), and a two-tone finish (silver slide/black receiver). In the EU the 43X comes with a rail. •
Glock 45: The Glock 45 , similar to the Glock 19X, incorporates Gen5 features catered for police use. The Glock 45 frame features a full-size grip length like the Glock 17, with a shorter Glock 19-length dust cover, and is fitted with a Glock 19 slide with front slide serrations. Unlike the Glock 19X, the Glock 45 features a flared magazine well and can accommodate Gen 5 magazines because it does not have the front lip that blocks the Gen 5 magazine's extended floor plate. The Glock 45 also deletes the lanyard loop found at the back of the grip on the 19X and comes standard with plastic sights instead of the night sights standard on the 19X. •
Glock 46: The Glock 46 is a "compact" version like the Glock 19. This model has a
rotating barrel breech lock system. It had been designed as option to bid for a service pistol, with law enforcement agencies in Germany at state and federal level in mind. The differing breech-lock system allows disassembly of the firearm without pressing the trigger, provided no projectile is chambered. Also, enhanced drop-safety is a must – the model complies with the specifications in the German
technical guideline (Technische Richtlinie "Pistole") for service pistols. Police in
Saxony-Anhalt chose the
Glock 46 TR among three competitors and are to receive up to 8,600 new pistols until 2021 for over 6,400 officers, replacing their ageing
Pistole 6 (P6), a
SIG Sauer P225 variant. The state of Saxony-Anhalt is the first to introduce a pistol made by Glock as a standard-issue sidearm into its force. In short, G47 and G19 Gen5/MOS/MOD1/FS have modularity between both pistols. Reportedly, the US Secret Service is also using this model, and the G47 Gen 5 MOS is now available to the public. •
Glock 48: The Glock 48 is a "slimline" version similar to the subcompact Glock 43 and 43X. All components of the Glock 48 are identical to those of the Glock 43X, except the slide and barrel, which are longer. The slides for the Glock 43, Glock 43X, and Glock 48 are functional on any of those three frames. The G48 features a 4.17-inch-long barrel, front slide serrations, a built-in extended beaver tail, a reversible magazine catch (similar to Gen 5 models), GMB rifling (again similar to Gen 5 models), a two-tone finish (silver slide/black receiver), and a magazine capacity of 10 rounds. At least three aftermarket sources manufacture 15-round flush-fit magazines for the Glock 43X and Glock 48, which make the Glock 43X and Glock 48 match the standard capacity of the Glock 19 in a narrower pistol. •
Glock 49: In November 2023, American firearms distributor TALO Distributors announced the introduction of the Glock 49. It used the full-length Glock 47 slide and the Glock 19 frame. The slide is cut for the MOS optics option. The model is sold exclusively through TALO Distributors. Glock does not offer to sell it directly. The new model is essentially a crossover similar to the Glock 45, but in reverse. Instead of a compact slide mated to a full-grip frame, it is a full-length slide mated to a compact frame.
9×21mm • The
9×21mm pistol cartridge was adopted and commercialized by
Israel Military Industries for those markets (such as in France, Italy, and Mexico) where military service cartridges like the 9×19mm Parabellum are banned for civilian use. Glock produces 9×21mm-chambered versions of the Model 17, and other 9mm Parabellum models, for these markets. These alternative caliber versions are marked with the same model number as the 9mm Parabellum version only differing in the barrel and caliber marking. Glock does not export or produce the 9×21mm pistols for the United States commercial market. This makes any 9×21mm Glock model a unique and highly desirable item for US firearm collectors. A limited number of 9×21mm Glocks have found their way into the US and are mostly held by collectors and gun enthusiasts.
10mm Auto •
Glock 20: The Glock 20, introduced in 1991, was developed for the then-growing law enforcement and security forces market for the
10mm Auto. The pistol handles both full-power and reduced "FBI" loads, which have lower muzzle velocity. Due to the longer cartridge and higher pressures, the pistol is slightly larger than the Glock 17, having a roughly greater width and greater length. Though many small parts interchange with the Glock 17, with a close to 50% parts commonality, the major assemblies are scaled-up and do not interchange. The standard magazine capacity of the Glock 20 is 15 rounds, and there are no other factory magazine offerings. In 2009, Glock announced that it would offer a -barrel as a drop-in option. The Glock 40 uses the same magazine as the Glock 20.
.45 ACP Glock pistols chambered for the
.45 ACP (and the
.45 GAP) feature
octagonal
polygonal rifling rather than the hexagonal-shaped bores used for models in most other chamberings. Octagonal rifling provides a better gas seal in relatively large diameter rifled bores, since an octagon resembles a
circle more closely than a hexagon. Compared to the Glock 20 chambered in 10mm Auto, the slide of the Glock 21 is lighter to compensate for the lower-energy .45 ACP cartridge. The standard Glock 21 magazine is of the single-position-feed, staggered-column type with a capacity of 13 rounds. While there is no other factory magazine, a "+1" base plate is available to make the magazine 14-round. The .45 ACP Glock 21 is capable of firing
.45 Super ammunition. •
Glock 21SF: The 21SF is a version of the Glock 21 that uses a Short Frame lower which is based on the standard G21 frame (same width), but reduces trigger reach from the back of the grip by , and the heel of the pistol is shortened by so the trigger can be reached and operated better by users with smaller hands. •
Glock 30: The Glock 30 is a .45 ACP version of the subcompact Glock 29, with a standard magazine capacity of 10 rounds. The standard magazine includes a "+1" base plate, and can be made into a 9-round magazine by swapping in a flush base plate. The factory magazine from the Glock 21, with a capacity of 13 rounds (14 rounds with the +1 base plate), will function in the Glock 30. •
Glock 30SF: The 30SF is a version of the Glock 30 that uses a Short Frame lower, which is based on the standard G30 frame (same width), but reduces trigger reach from the back of the grip by . The G30SF accepts the same double-stack .45ACP magazines as the G30 and G21. •
Glock 30S: The 30S is a version of the Glock 30 that features a thin slide (same slide as the G36), a Short Frame lower, and the same double stack magazines as the Glock 30 and 21. Like the G30, G30S magazines holds 10 rounds. •
Glock 36: The Glock 36 is a "slimline" version of the subcompact Glock 30 that features an ultracompact slide and frame and is chambered for the .45 ACP cartridge. The Glock 36 is the first Glock pistol to be manufactured with a single-stack magazine, having a standard capacity of six rounds and being unique to the model. The Glock 36 cannot use factory magazines from its larger relatives due to its single-stack magazine design. •
Glock 41: The Glock 41 is a competition version of the Glock 21, much like what the G34 is in relation to the G17; it features a 5.3-inch barrel and an elongated slide. The Glock 41 is only made with the "Gen4" frame.
.40 S&W In 1990, Smith & Wesson and Winchester developed the
.40 Smith & Wesson by shortening the 10mm case. This created a round that was more powerful than the 9mm Parabellum but with more manageable recoil. The round was also still operable in the smaller frame size used for Glock 9mm models. As is typical of many pistols chambered in .40 S&W, each of the standard Glock models (22, 23, and 27) may be easily converted to the corresponding
.357 SIG chambering (Glock 31, 32, and 33, respectively) simply by replacing the barrel. No other parts need to be replaced, as the .40 S&W magazines will feed the .357 SIG rounds. •
Glock 22: The Glock 22 is a .40 S&W version of the full-sized Glock 17 introduced in 1990. The pistol uses a modified slide, frame, and barrel to accommodate the differences in size and power between the .40 S&W cartridge. The standard magazine capacity is 15 rounds. A 10-round version of this magazine is also offered for those markets where the magazine capacity for handguns is restricted. Additionally, the standard magazine is available with a "+1" base plate to make it a 16-round magazine. And, there is a Glock factory 22-round extended magazine offered. One can also swap in the +1 base plate to make that a 23-round magazine. The Glock Model 22 is favored and used by multiple law enforcement agencies around the world, including the
Baltimore Police Department,
Los Angeles Police Department,
Miami Police Department,
Maryland State Police, Cumberland County Sheriff's Department (NJ),
Overland Park Police Department,
Kansas City Police Department,
Missouri State Highway Patrol, and
Alaska State Troopers in the United States; the
NSW Police Force,
Queensland Police Service and the
Northern Territory Police Force in Australia; the
Edmonton Police Service,
Calgary Police Service,
Alberta Sheriffs Branch,
Winnipeg Police Service,
Toronto Police Service,
Ottawa Police Service, and
British Columbia Sheriff Service in Canada; and the
National Bureau of Investigation (Philippines). •
Glock 23: The Glock 23 is a .40 S&W version of the compact Glock 19. It is dimensionally identical to the Glock 19 but is slightly heavier and uses a modified slide, frame, and a .40 S&W barrel, with a standard magazine capacity of 13 rounds. For jurisdictions that limit handgun magazine capacity, Glock also offers a 10-round version of the standard magazine. There is also a factory 14-round version of the standard magazine using the +1 base plate. Finally, any magazine made for the Glock 22 will work in the Glock 23. •
Glock 23C: Introduced in 1998 as part of the Generation 3 production series. This Glock 23 variant comes from the factory with two ports cut in the barrel and corresponding slide cuts. This allows gases to be ported upwards on firing, providing downward force on the muzzle. They were not as popular with law enforcement agencies as the standard 23C, but were utilised by the Fulton County Sheriff's Department, of Georgia, United States. •
Glock 24: The Glock 24 is a .40 S&W long-slide variant of the Glock 22, similar in concept to the Glock 17L. Additionally, a compensated, ported-barrel version designated the 24C was also produced. The Glock 24 was introduced in 1994 and officially dropped from the company's regular product lineup upon the release of the Glock 34 and 35. The Glock 24 can use any magazine made for the Glock 22. •
Glock 27: The Glock 27 is a .40 S&W version of the subcompact Glock 26, with a standard magazine capacity of 9 rounds. Glock also offers a 10-round version of this magazine with the +1 base plate. The factory magazines from the larger Glock 22 and 23 will fit the Glock 27, increasing capacity to 13, 14, 15, 16, or 22 rounds. Spacers are available that fit on these larger-capacity magazines themselves; they have the effect of "extending" the magazine well of the pistol, thereby improving the ergonomic feel of the pistol when the longer magazines are inserted. •
Glock 35: The Glock 35 is a .40 S&W version of the competition Glock 34. The Glock Model 35 was the service pistol for the
Kentucky State Police, but by the summer of 2017, they had reverted from the Glock 35 back to 9mm weapons because of penetration improvements in the 9mm bullets, noting some officers had never been able to make the switch from 9mm to .40 S&W in the first place due to their struggles in mastering the higher caliber. The Glock 35 can use any magazine made for the Glock 22.
.380 ACP , is currently the smallest Glock handgun produced as of 2023. The Glock 42 was also the first Glock to be entirely manufactured domestically in the United States—due to import-export restrictions from Austria to the United States market. The first two
.380 ACP models (Glock 25 and 28) were released in 1995 to provide a less powerful alternative to the 9mm Parabellum and 9×21mm, primarily intended for markets such as Brazil that prohibit civilian ownership of firearms chambered in more powerful calibers. Made in Austria, import restrictions ban civilian importation into the United States, but a limited Glock 28 run was manufactured in Glock's US plant for US sale. The Glock 25 and 28 are banned in Canada as they do not meet the minimum handgun barrel length requirements. Due to the relatively low
bolt thrust of the .380 ACP cartridge, the locked-breech design of the Glock 19 and Glock 26 was minimally modified for the Glock 25 and Glock 28 to implement unlocked breech operation. It operates via
straight blowback of the slide. This required modifying the locking surfaces on the barrel and redesigning the former locking block. Unusual for a blowback design, the barrel is not fixed to the frame. It moves rearward in recoil until it is tilted below the slide, similar to the standard locked-breech system. The reduced size and mass of the Glock 42 allowed the return to the Glock-standard locked-breech design. •
Glock 25: The Glock 25 , introduced in 1995, is a blowback derivative of the compact ( barrel) Glock 19. The magazine capacity is 15 rounds. Standard fixed sight elevation is 6.9 mm, unlike the 6.5 mm elevation used for the 9×19mm models. •
Glock 28: The Glock 28 , introduced in 1997, is a blowback derivative of the subcompact ( barrel) Glock 26. The standard magazine capacity is 10 rounds, but the 15-round Glock 25 magazine will function in the Glock28. Standard fixed-sight elevation is 6.9 mm, unlike the 6.5 mm elevation used for the 9×19mm Parabellum models. •
Glock 42: The Glock 42 , introduced in 2014, is a locked-breech "slimline" ( barrel) design, the smallest model Glock made. The single-stack magazine holds six rounds. US-manufactured Glock 42s may be sold for civilian use in the US.
.357 SIG In 1994, SIG and Federal developed the
.357 SIG to match the ballistics of typical .357 Magnum loads. This was done by necking down a shortened 10mm case to .357, which made it easy for Glock to alter their .40 Smith & Wesson models to the new caliber. As is typical of pistols chambered in .357 SIG, each of the standard Glock models (31, 32, and 33) may be easily converted to the corresponding .40 S&W chambering (Glock 22, 23, and 27, respectively) simply by replacing the barrel. The .357 SIG magazines differ from the .40 S&W counterpart by adding an internal rib on each side of the magazine body, with cutouts for the follower. This guides the bottlenecked cartridges through the feeding process. While it is possible to load .40 S&W into these magazines, the friction causes the larger rounds to lock up inside the magazine body, which can induce malfunctions. .40 S&W magazines do not have this feature and can load both .357 SIG and .40 S&W respectively. •
Glock 31: The Glock 31 is a .357 SIG variant of the full-sized Glock 22. The standard magazine capacity of the Glock 31 is 15 rounds. It can also accept magazines intended for the Glock 22. •
Glock 32: The Glock 32 is a .357 SIG variant of the compact Glock 23. The standard magazine capacity of the Glock 32 is 13 rounds. It can also accept magazines intended for the Glock 31, Glock 22, or Glock 23. •
Glock 33: The Glock 33 is a .357 SIG variant of the subcompact Glock 27. The standard magazine capacity of the Glock 33 is 9 rounds. It can also accept magazines intended for the Glock 32, Glock 31, Glock 22, Glock 23, and Glock 27.
.45 GAP Glock pistols chambered for the .45 GAP (and the .45 ACP) feature octagonal polygonal rifling rather than the hexagonal-shaped bores used for models in most other chamberings. The standard magazine capacity of the Glock 38 is 8 rounds, but it can use the 10-round magazines of the Glock 37. •
Glock 39: The Glock 39 is a .45 GAP version of the subcompact Glock 26. The standard magazine capacity of the Glock 39 is 6 rounds, but it can use the 8- and 10-round magazines of the Glock 37 and Glock 38.
.22 Long Rifle •
Glock 44: The Glock 44 is a
.22 Long Rifle rimfire model based on the Glock 19. While the Glock 44 is similar in size to the Glock 19, it has a magazine capacity of 10 rounds and uses a simple blowback mechanism rather than the locked-breech mechanism used on nearly all other Glock pistols. The Glock 44 is lighter than the G19 at 12 ounces. It retains Glock's polygonal rifling, which Glock has tested to work with lead .22 bullets. It uses a steel/polymer composite slide due to the lower slide mass required to function with the less powerful cartridge. The 44 uses the company's proprietary "Safe Action" trigger, and of a footprint such that holsters made for the 19 or 23 are interchangeable with the 44. == Production in other countries ==