![]() ![]() Hillside Manufacturing machined reproduction operating rods, trigger housings, flash suppressors, bolts, operating rod spring guides and barrels. 0093XX A commercial unlined standard profile barrel, a commercial bolt and a commercial operating rod are used in the assembly of this standard model M1A.007041 A commercial unlined standard profile barrel and a commercial operating rod used to build standard model M1A.Factory installed barrels in this serial number range will be commercial manufacture but machined by Hillside Manufacturing (Dallas, PA) using Wilson Arms blanks. does not have USGI chromium plated barrels for assembly of complete rifles. 007XXX to 037XXX Springfield Armory, Inc.These receivers are serviceable, no other issues reported. The elevation serrations wear prematurely but can be repaired using an elevation disk. 007XXX to 020XXX SOME receivers made from AISI 4140 alloy steel.004357 to 004379 January 01, 1976: In this serial number range, a factory one year limited warranty is in force after the initial purchase of a rifle.was located in Texas is estimated at about 004075. Based on this output, the highest receiver serial number while Springfield Armory, Inc. During July and August 1974, Valley Ordnance was completing 75 receivers per week. in Texas was sold around Novemto Bob Reese in Illinois. resumed receiver production on Septemat serial number 003701. 003700 Highest documented serial number for receiver production while Springfield Armory, Inc.003306 Highest documented serial number (stripped receiver) shipped from Springfield Armory, Inc.002903 Lowest documented serial number (complete rifle) shipped from Springfield Armory, Inc.002884 to 010048 At some point in this serial number range, the receiver design was changed to incorporate a hemispherical cut in the windage knob ear outboard side (commercial NM rear sight). BUSHMASTER SERIAL NUMBER MANUFACTURE DATE SERIAL NUMBERSSerial numbers after this have noticeably less steel cut away in the bolt raceways after of the cartridge clip guide.
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