YHM Flip up front sight Gas block with lower Rail.
YHM Flip up front sight Gas block with lower Rail.

AR 15 M 16 front Sights

Flip up front sights for the AR-15.
Flip Up front sights and gas blocks some sights fit on your gas block with a picatinny rail.

YHM Flip Up front Sight

YHM Front Flip Sight Tower With Bottom Rail.