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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/30/2005 12:34:23 PM EDT
Swapping out a barrel and building an A4. I have a Colt 20" Gov't. barrel that was originally (tightly!) on a C7 upper. Gonna put this on a flattop CMT upper.

I am aware that the "F" marked FSB
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