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11/9/2018 9:21:38 PM
Posted: 3/12/2005 6:35:23 PM EST
I have an A1 upper receiver with a circle in a square just in front of the ejection port cover.
Link Posted: 3/12/2005 6:40:11 PM EST
Link Posted: 3/12/2005 6:52:00 PM EST
wow, I thought colt only used a C mark
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