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Posted: 1/31/2009 4:52:56 PM EDT
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I have an early colt A1 complete upper and would like to know more about it.
barrel is marked C MP CHROME BORE square with a C and Triangle forge marks thanks 
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Hard to tell from that small pic, but it looks like a late 604, maybe with an A2 door, and those barrel marking began in '74, the improved 3 prong FH's were used from '63-'67
Go here for more info on 604's Take some close up pics of the receiver please 
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