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 clamping screws (no dimpling required).
Manufactured from high quality steel, finished with a mil. spec. phosphate coating.
Barrel diameter of .750 inches.

Includes (1) steel gas block and (1) stainless steel roll pin