After the Sandy Hook Elementary School shooting in
Newtown, Connecticut on December 14, 2012, new attention was paid to firearms laws in America. The perpetrator had used a
Bushmaster XM15-E2S semi-automatic rifle. Certain
AR-15 rifles were considered
assault weapons under the federal
Assault Weapons Ban of 1994, which expired in 2004, and some are considered assault weapons in states that have such bans in force. In the wake of the shooting, there were calls for new or stricter gun control laws. In response to concerns that the federal and state governments would limit the sale of firearms and ammunition, sales of firearms hit an all-time high in December 2012, with the FBI reporting that 2.8 million NICS background checks were performed that month, with the vast majority after the date of the shooting. A corresponding large increase in ammunition sales also occurred during this time, with some retailers reporting in January 2013 that they had already sold stock that had been expected to last for a couple of years, sometimes in the span of a single day. On April 17, 2013, the main Congressional action introduced after the shooting, the Manchin-Toomey amendment, failed in the Senate, marking the end of the strongest push to implement new firearms laws on a federal level. However, many states passed new firearms restrictions, such as
Colorado,
Connecticut,
Maryland, and
New York. Regardless, the massive increase in ammunition sales earlier in the year had severely limited the continued availability of these products in the market, with many ammunition manufacturers unable to keep up with the demand even after running 24/7 shifts at all of their factories. Additionally, despite the defeat of the federal bill, a significant number of firearms owners remained concerned about the possibility of future actions to limit the availability of certain firearms and ammunition, and continued to accumulate ammunition well into the later parts of 2013. The clearest explanation of the problem, according to
The Motley Fool, comes from
Hornady Manufacturing's president, Steve Hornady: People walk into the store, they don't see as much as they want so they take everything they can get. The next guy who comes in can't get anything, so he panics. ...this shortage] is purely a consumer driven shortage. In 2016, certain calibers of ammunition, most notably
.22 long rifle, were still reported as being in short supply. ==Response by manufacturers and distributors==