The AMT Backup is a small semi-automatic pistol. It was first manufactured by the Ordnance Manufacturing Corporation (OMC) of El Monte, CA. The first guns made in

.380 ACP The .380 ACP (9×17mm) ( Automatic Colt Pistol) is a rimless, straight-walled pistol cartridge developed by firearms designer John Moses Browning. The cartridge headspaces on the mouth of the case.Wilson, R. K. ''Textbook of Automatic Pisto ...

by OMC are known as the OMC Backup. OMC produced a short run of these pistols before the tooling was purchased by Arcadia Machine & Tool, who took over production. AMT

Backup pistols were made by AMT in El Monte, Covina

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, and

Irwindale Irwindale is a city in the San Gabriel Valley, in Los Angeles County, California. The population was 1,422 at the 2010 census, down from 1,446 at the 2000 census. The ZIP Codes serving the area are 91010, which is shared with Duarte, 91702, w ...

, CA. The original AMT Backup was produced with a single-action only (SAO) trigger mechanism, while the later "Small Frame" and "Large Frame" Backup used a double-action-only (DAO) mechanism. These pistols were manufactured by AMT and later Galena Industries (until November 2001). SAO pistols were made with a manual safety, while DAO guns relied on their heavy trigger pull for safe handling. The AMT Backup was available in a wide range of calibers:

.22 LR The .22 Long Rifle or simply .22 LR or 22 (metric designation: 5.6×15mmR) is a long-established variety of .22 caliber rimfire ammunition originating from the United States. It is used in a wide range of rifles, pistols, revolvers, smooth ...

.38 Super The .38 Super, also known as .38 Super +P, .38 Super Auto, .38 Super Automatic, .38 Super Automatic +P, or 9×23mmSR, is a pistol cartridge that fires a bullet. It was introduced in the late 1920s as a higher pressure loading of the .38 ACP, a ...

, 9×19mm,

.357 SIG The .357 SIG (designated as the 357 Sig by the SAAMI and 357 SIG by the C.I.P. or 9×22mm in unofficial metric notation) is a bottlenecked rimless centerfire handgun cartridge developed by the Swiss- German firearms manufacturer SIG Sauer, ...

, .40 S&W,

.400 Corbon The .400 Corbon is an automatic pistol cartridge developed by Cor-Bon in 1997. It was created to mimic the ballistics of the 10 mm Auto cartridge in a .45 ACP form factor. It is essentially a .45 ACP case, necked down to .40 caliber with a 2 ...

and

.45 ACP The .45 ACP ( Automatic Colt Pistol) or .45 Auto (11.43×23mm) is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it ...

have all been offered. The pistol's marketing slogan was "the smallest, most powerful" backup weapon available (referring to the 45 ACP version). The AMT Backup line of handguns were being marketed by High Standard Manufacturing.

Sources

Semi-automatic pistols of the United States .380 ACP semi-automatic pistols .22 LR pistols .38 Super semi-automatic pistols 9mm Parabellum semi-automatic pistols .357 SIG semi-automatic pistols .40 S&W semi-automatic pistols .45 ACP semi-automatic pistols {{Pistol-stub