Quick view Phase 5 Weapon Systems Phase 5 Weapon Systems Lo Pro, Phase5 Lo Pro Gas Block Set Screw $24.56 $20.70 This gas block replaces your existing front sight to provide a simple, low profile design that can be used to mount a rifle length forearm to a carbine length barrel.It is mounted by the use of two screws.Compatible with 0.750" barrels.Made in the usa... Compare Add to Cart
