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Posted: 2/13/2006 12:06:15 PM EDT
[Last Edit: 2/13/2006 12:13:28 PM EDT by orca2726]
I plan on building a 20" 1/7 govt profile flat top and I have seen barrels advertized with standard and "F" marked FSB. What is the difference and which is the correct one for use with the sights on a removable handle/rear sight assy?

TIA

orca2726

C & R FFL 03
Link Posted: 2/13/2006 1:06:28 PM EDT
F for flat top upper.

The base (where the front sight post goes) of the F marked Front Sight Base is about 0.040" taller than the standard.
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