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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
Link Posted: 8/30/2005 12:46:25 PM EDT
d00p!
Link Posted: 8/30/2005 3:08:30 PM EDT

Originally Posted By OODA_Loop:
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



If the FSB is already "F" marked, sounds like you'll just need a BUIS and you'll be set.

WIZZO
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