AAC makes excellent suppressors, no doubt about it. I have a couple of the ELEMENT2, a TiRANT .45, a TiRANT 9S, an M4-2000, a 762-SDN-6, a MK13-SD and a TiTAN-QD. In terms of the materials used and overall quality I have nothing but good things to say. The problem is that they didn't fully engineer the QD system on the rifle suppressors that use 18T, 51T or 90T muzzle brake/flash hider interfaces. Conceptually their cam/ratchet QD design is great and it probably worked really well in the prototype phase when everything was hand fitted. However, once in production, and with tolerance stacking on the brakes/flash hiders and suppressor internals, coupled with the fact that even with the 90T brake there's 4° between "teeth" on the locking ring, there's just no way to maintain the necessary relationship with the suppressor and brake. What I've found is that I need to time each brake to the suppressor. This means polishing material off the locking "cone" such that the suppressor internal locking surface makes hard contact with the brake/flash hider cone right as the trailing faces of the two teeth on the locking cam make full contact with the leading faces of two teeth on the locking ring. This is a pain in the butt for sure.
AAC claims that even though the QD supressors can rotate back and forth through some nominal angle while "locked" on the rifle, there's no deleterious affect on accuracy. This is total rubbish since I've seen accuracy go to hell in a hand basket on all four rifles as a result of the suppressor shooting loose. I apologize for the rant but AAC could have, and should have, done more to resolve this issue. Now I'm buying Dead Air Armament suppressors since they seem to have built a better QD mousetrap. Once Dead Air expands their lineup to .338 caliber and pistol suppressors they'll put a big dent in AAC. Having said all that, the AAC rifle suppressors are well made, do a great job of reducing noise, and when not shooting loose are very accurate. I wouldn't be looking elsewhere if not for the QD system as designed and would most likely be a happy camper had I bought the direct thread models instead.
AAC claims that even though the QD supressors can rotate back and forth through some nominal angle while "locked" on the rifle, there's no deleterious affect on accuracy. This is total rubbish since I've seen accuracy go to hell in a hand basket on all four rifles as a result of the suppressor shooting loose. I apologize for the rant but AAC could have, and should have, done more to resolve this issue. Now I'm buying Dead Air Armament suppressors since they seem to have built a better QD mousetrap. Once Dead Air expands their lineup to .338 caliber and pistol suppressors they'll put a big dent in AAC. Having said all that, the AAC rifle suppressors are well made, do a great job of reducing noise, and when not shooting loose are very accurate. I wouldn't be looking elsewhere if not for the QD system as designed and would most likely be a happy camper had I bought the direct thread models instead.