Problem:Picatinny Railed Gas Blocks do not accommodate a same-plane aperture front sight.
Solution:The Troy Industries Gas Block Mounted Front Sight.
Troy engineered a rugged, reliable, BattleReady™ BattleSight™ that mounts securely on the gas block. It offers all of the features of Troy’s other Folding BattleSights: Easy to operate, clicks solidly into place and folds out of the way when not needed. (Not compatible with four-sided rail gas blocks).
Mounts securely on the gas block.
Built-in swivel attachment on both sides.
Designed to work on gas blocks that are lower than upper receiver plane.