BCM FSB Front Sight Base for Flat Top Uppers, "F" Marked - .750 ID

Inter-Store Transfer
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BCM A2 "F" Marked Forged Front Sight Base Gas Block. This FSB is designed for .750 diameter barrels and features a bayonet lug. These "F" marked forged Front Sight Bases provide the proper height for rear sights when used in conjunction with an M4 flattop upper receiver.

This FSB requires tapers pins(not included) and must be properly drilled by a gunsmith.

*Does not include sight post assembly or sling swivel.