m1 carbine national postal meter serial numbers

Gas pistons were unmarkedĮxcept by the subcontractors who manufactured them for Inland Mfg. Gas pistons remained unchanged throughout production. Right: Later Gas Piston Nut, countersunk to allow more piston movement

Not toīe confused with BI marked barrels manufactured by Brown-Lipe-Chapin for Inland (see below).Īrrows indicate openings for securely staking the gas piston nut to the gas cylinder

Note: BI marked gas piston cylinders were manufactured by B & P Motor Company for Inland. The subcontractors were assigned different markings. Inland also subcontracted a number ofĬompanies to manufacture additional gas piston cylinders. Inland manufactured their own gas cylinders, occasionally marked II or I-I. Gas cylinders having the name Rock-Ola were used only on Rock-Ola barrels. With the exception of Rock-Ola, prime contractors did not place their entire name on their

Swaged gas cylinders were normally manufactured by the company who manufactured the barrel. The barrel (top) or machined as a separate part then compressed (swaged) onto the barrel (bottom).Ĭut-away showing Swaged Gas Cylinder pressed onto barrel and gas port drilled through gas cylinder and barrel The gas cylinder was machined integral with Gas cylinders were manufactured by one of two methods. Government have 4 lands and grooves.Ĥ lands and grooves, shown from chamber end of the barrel 30 Caliber Carbine barrels manufactured under contract to the U.S. *measured from the muzzle to the end of the skirtĪll.

M1 carbine national postal meter serial numbers