For a firearm (including surplus weapons) that is a U.S. military issue weapon, use the MAK Field code USA. Common U.S. military issue weapons are:
.45 caliber and/or 9mm U.S. Submachine Guns: Ml, M1A1, M1928, M1928A1 (Thompson), M50, M55 (Reising), M42 (United Defense), M3, M3A1 (Grease Gun)
.45 caliber U.S. (Colt) Pistols, M1911 and 1911A1
.45 caliber U .S. Revolvers, M1917
.30 caliber U.S. Carbines, Ml, M2, M3
.30 caliber U.S. Rifles Models 1892, 94, 96, 98 (Krag), Models 1903 and 1903A3, etc. (Springfield), Ml (Garand), M1917 (Enfield)
7.62 mm U.S. Rifle, M14
5.56 mm U.S. Rifle, M16 and M16A1, etc.
.30 caliber U.S. machine-guns (including the Browning Automatic Rifle, etc.)
.410 gauge and/or .22 caliber U.S. Survival guns, M4 and M6
For list of codes for U.S. Military Issue Weapons, see the GUN MAKE for U.S. MILITARY-ISSUE WEAPONS section of this manual.