I bought it for my 12.5" 6.5 Grendel pistol upper to bring it to a legal 16.1" after its pinned. That will give me about 1,000 foot pounds per square inch at 300-350 yards. It's going to be an awesome little deer rifle that's easy on the ears. I also ordered a an adapter for my 18" .223 wylde and put my extended CNC Warrior 4 piece on it. With my .22 adapter I shot some subsonic .22lr and the combo of no sound barrier crack, long barrel and the brake redirecting noise down range it is very easy on the ears. Next I'm hoping they start to thread them for 5.56 and .30 muzzles. If so I will buy more, if not I'll have to buy the adapters too...lol So much nicer looking than a Flaming Pig. THANK YOU CNC WARRIOR FOR AND AWESOME PRODUCT!!!!