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Posted: 6/15/2009 10:22:17 AM EDT
I am switching from a flat top to a A2 upper...I'm not sure if I even have a F marked fsb, but if I do, Is it compatible with a A2 receiver?  the barrel is a BM superlight
Link Posted: 6/15/2009 11:32:32 AM EDT
I really like this link. Scroll down till you see the FSB for your answer but a lot of other good information as well.

Link Posted: 6/15/2009 12:45:09 PM EDT
F height is a slightly taller front sight.  Rear sights used in combination with a flattop receiver will usually need an F height front sight to zero correctly.
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