![]() ![]() 30 carbine barrels were also used by Universal Firearms and National Ordnance. Theįirst barrels 1962-1963 were 12 groove, followed by 6 groove barrels 1964-1969, then the standard 4 grooves common to the GI M1 Carbine barrels in the 1970's. 1903 barrels had four lands and grooves, 1903A3 barrels had either four or two lands and grooves.Ībout 1962 Plainfield switched to acquiring their barrels from Small Arms Manufacturing of Bridgeville, PA, predecessor to the current barrel manufacturer E.R. In the early years as no one was making them. Next to surplus GI receivers, barrels were the one part most difficult to obtain While this may sound like a poor method of making barrels, the end result has proven otherwise. Forįurther on this practice refer to National Ordnance. The first barrels used by Plainfield Machine were made using a sleeve that included the barrel threading and gas piston housing, into which was inserted surplus Springfield 1903/1903A3 barrel machined to carbine dimensions (example s/n B311). ![]() If a Plainfield Machine carbine has a surplus GI barrel it was added after the carbine was sold by Plainfield Machine. GI barrels may be used as replacements for the barrels used by Plainfield Machine. The threads on the breech end of the barrels used by Plainfield Machine are compatible with the GI receivers. The only parts not interchangeable with their GI counterparts were those parts specific to a particular model, the rubber buttplate they used starting about 1966, and the Phillips head recoil plate screw with it's matching escutcheon nut.Īll metal non-GI parts, with the exception of the barrels, were manufactured using investment casting, a technology that by the 1960's had progressed to a degree not available when the WWII GI carbine parts were made. By approximately 1968 almost all parts were commercially manufactured. Surplus GI parts and made the parts of the Plainfield carbines almost 100% interchangeable with their surplus GI equivalents. As a particular surplus GI part became less available they arranged for commercial production made to GI dimensions. Plainfield acquired surplus GI parts whenever and wherever they could obtain them. Post WWII Commercially Manufactured M1 Carbines (U.S.A.)
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