It works but beware. - Advanced Armament Corporation Muzzle Brake, 5.56mm, 51t, 1/2-28

This adapter works great when attaching the suppressor to the firearm. That being said do not ever shoot your gun without the suppressor with this muzzle brake. We were testing with and without....ONE shot only with 5.56. No I didn’t have hearing protection for this one shot so that I could simulate hunting (1 shot). Everyone within 10 feet had temp hearing loss. It will deafen a shooter with one shot. Your weapon will be unusable unless you have ear protection at ALL times or the suppressor attached. It is like putting your ear against the end of the barrel. It works but be careful.