I have a Colt marked A2 fixed carry handle upper, and a Colt M4 barrel that has the F marked FSB. Should I file the front post down?
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Member
I have a Colt marked A2 fixed carry handle upper, and a Colt M4 barrel that has the F marked FSB. Should I file the front post down?
Senior Member
I would not be too concerned over it. I have used F marked FSBs with A1 uppers and had no issues with accuracy or adjustments. My 727 clone has a non-F marked FSB, so there was no issue there. You should have enough adjustment if it is needed with the A2 upper and F marked FSB. If not, then you can file the FSP a little bit.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
Member
No need to file the FSP 4 or so clicks down will get you zeroed...
I have built a few rifles with F marked FSB on fixed carry handle uppers and it has never been a issue...
Member
I had to go more than 4 clicks to get my XM177 clone zeroed (12 to be precise) but didn't have to bottom it out or file the post.
Last edited by LoboTBL; 06-07-16 at 00:15.
~Rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law' because law is often but the tyrant's will, and always so when it violates the rights of the individual.
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