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Posted: 9/6/2010 10:05:10 PM EDT
socom heavy barrel from colt.  Does not have the f stamped on the front sight.  Can someone tell me  if that makes any difference  as to which upper reciever it is for?   I was told the f indicates it is for the a3 flattop upper
Thanks.  
Link Posted: 9/8/2010 11:54:35 AM EDT
[#1]
Yes it has a F height FSB & no it doesn't matter which upper you use.
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