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NC, USA
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I have an A1 upper receiver with a circle in a square just in front of the ejection port cover.
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Posted: 3/12/2005 6:40:11 PM EST
That's a Colt proof mark, which was stamped on all factory assembled rifles up until about 8-10 years ago.
-Troy |
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NC, USA
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Posted: 3/12/2005 6:52:00 PM EST
wow, I thought colt only used a C mark
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