For use on M4 and M16-type weapons, the Smith Enterprises Good Iron .223 Muzzle Brake is designed for extremely rapid follow-up shots. This time-proven 14 gas port design is machined from 8620 steel with a 60RC surface hardness, and is salt bath nitrited for a corrosion-resistant finish. A Jam Nut is included. This brake is compatible with the SEI Direct Connect Sound Suppressor.

SPECS: Diameter: 0.860” OD / Length: 2.000”/ Jam Nut length: 0.200”/ Wrench Flats are cut for 3/4” wrench / Weight with Jam Nut 0.22 lb. / Threaded 1/2 X 28 TPI (RH).