I know it's one of colts because of the stamp above the trigger guard. The lower markings are -123 MMA 7075 The upper is marked 7075 KAE 71 where the ejection port should be. I didn't see a "c" where the c/h catch is. It is a fixed rear sight. On the lower there is no shelf like my semi's. And it is fenced around the safety. Any ideas? I was thinking maybe a 16a1?
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