Serial numbers after this have noticeably less steel cut away in the bolt raceways after of the cartridge clip guide.ĭuring July and August 1974, Valley Ordnance was completing 75 receivers per week.īased on this output, the highest receiver serial number while Springfield Armory, Inc. The rear end of the M1A receiver bolt right lug slot, located under the rear sight base cover, was extended 0.080 to the rear to prevent possible damage to the bolt roller. Note that the hand polishing served to enhance the aesthetic appearance but did not add to the functional ability of the M1A receiver.Īs Melvin Smith moved to semi-retirement the receiver surfaces noted above were finished by machine.įor example, the magazine well on M1A receivers was cut and broached by machine tool after Mr. This cosmetic detailing is evident as late as M1A serial number 062857 but was no longer being done by serial number 064922.
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