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Archived [ARCHIVED THREAD] - What upper receiver do I have???
Posted: 4/4/2006 8:35:57 PM EDT
There are no markings other than a marking that is shaped like a key hole right behind the brass deflector and the letter  M  on the front of the receiver above the gas tube.

Link Posted: 4/5/2006 3:49:59 AM EDT
[#1]
cant tell you what company but the keyhole means that Cerro Forge made the raw forging
Archived [ARCHIVED THREAD] - What upper receiver do I have???
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