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11/11/2007 4:28:03 PM EDT
I have an A2 Bushmaster I got in 10/04 and I've decided to change out the 14.5" barrel with Izzy FS to pencil barrel.  My question is what is the height difference between a standard FSB and the F marked FSB.  I'm leaning towards a CMMG LW barrel but I can get one from Bushmaster for a less.  With the standard FSB that's on it right now I'm out of adjustment with the factory post.  I think CMMG makes a better barrel and it's the one I want I just don't want any surprises.  
11/11/2007 5:02:52 PM EDT
[#1]
There is a 0.040" difference between a standard front sight base and a M4 type FSB (with the M4 being taller).

It's not a problem if you change between the two - it will only effects how far the front sight post is screwed in (adjusted during zero).
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