30 caliber carbine bullet works in a 1903/1903A3 barrel, without having to change the inside dimensions. Most 1903A3 barrels have two lands and grooves. Most 1903 barrels, and all GI carbine barrels, have 4 lands and grooves. Earlier carbine barrels were slightly tighter. 30 M1 on the front, NAT’L ORD/ INC on the rear and with the serial number just ahead of the rear sight. 30 Carbine Action Type: Semi Auto, Detachable Magazine Markings: The top of the receiver is marked U.S. 30 caliber carbine barrels had a groove diameter between. Model: M1 Carbine Serial Number: 4887 Year of Manufacture: Late 1962 to 1968. 30 Carbine ball bullet weighs 110 grains (7.1 g), a complete loaded round weighs 195 grains (12.6 g) and has a muzzle velocity of 1,990 ft/s (610 m/s) giving it 967 ftlbf (1,311 joules) of energy, when fired from the M1 carbine's 18-inch barrel. The 1903A3 barrel has a groove diameter of. Generally, as there are variations, the interior dimensions of a 1903 barrel are a groove diameter of. 30 caliber carbine barrels was an issue all of the manufacturers had to contend with in the early 1960's.īesides availability, there was a good reason for using 1903/1903A3 barrels as a replacement for unavailable GI carbine barrels. Variations of the above barrels have also been found on carbines built by Millville Ordnance and Erma's Manufacturing, both of which existed during the early 1960's at the same time as National Ordnance. “Use of the surplus Springfield 1903/1903A3 barrels was not limited to National Ordnance.
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