Colt AR-15/6721 - Does anybody recognize these forge codes
- Thread starter DesertRat
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The keyhole is the Cerro Metal forge marking, but that doesn't tell you a thing about who made it. Cerro is the forge that supplied the raw piece to the maker; and all the major makers have used Cerro fogings at on time or another.
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DesertRat
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Finally found out over on ARF. The forge codes are Cerro / Diemaco. This Colt was made by Colt Defense, Canada.
Spreadfire Arms
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actually, since the upper receiver has these proof marks, the upper receiver was made by Diemaco (Canada). the entire rifle, may or may not have been. 
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DesertRat
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Well, regardless, the entire thing is an exercise in semantics because either Colt or Diemaco built the gun. Either way, Diemaco has been licensed by Colt since 1976 and Colt recently purchased Diemaco lock, stock and barrel.
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