For use on .308, 7.62×39, and .300 Blackout caliber AR platform rifles or barrels, he Smith Enterprises Good Iron .308 / 7.62×39 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.
NOTE: These are not for use with SEI M4DC Sound Suppressors.
SPECS: Diameter: .905” 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 5/8” X 24 TPI (RH)