.50 Caliber BMG Regulation Act of 2004

The legislature of California declared that "proliferation and use" of .50 BMG rifles posed a terrorist threat, as well as a threat to the "health, safety, and security of all residents" of California. The law specifically allowed a registration period of one year, now passed, to register any such firearms, after which unregistered weapons would become illegal firearms. Definitions "A .50 BMG rifle is defined as a centerfire rifle that can fire a .50 BMG cartridge and is not already an assault weapon ... or a machinegun" Exceptions/Exclusions to California Penal Code 30905, et al. The law does not apply to the law enforcement officers with permission from their employing agencies. ==Controversy==

As a result of the ban, the Barrett Firearms Company announced it would no longer sell to or service any of its rifles in the possession of any California government agency. A 1999 Justice Department Office of Special Investigations briefing on .50 caliber rifle crime identified several instances of the .50 BMG being involved in criminal activities. Only one instance (the Branch Davidians at Waco, Texas) involved the alleged use of a .50 BMG during the commission of a crime; the remainder involved illegal possession (e.g. stolen), not use. The briefing did not identify any instance of a .50 BMG rifle being used in the commission of a murder. According to the GAO report there were no instances of violent crime with a .50 BMG rifle, while providing examples of crimes that had occurred: a doomsday cult possessed 10 rifles and were arrested for using false identities, a .50 BMG rifle was stolen and later recovered, and a claim by the ATF that the Branch Davidians fired a .50 BMG prior to the ATF firing tear gas and incendiary devices at the occupied structure. No .50 BMG rifles were reported recovered after the ATF siege at Waco ==Alternative cartridges==

The .510 DTC Europ has since been introduced to take advantage of the highly specific language used in the act. The round provides almost identical ballistics and performance, but cannot be used in weapons chambered for .50 BMG. Barrett has since produced the .416 Barrett, a necked-down .50 BMG case using a .416 caliber bullet, which is not subject to the .50 BMG Act because of the smaller caliber. It has the benefit of having a flatter trajectory and longer effective range than the .50 BMG. ==See also==