I have seen it on a Wilson UT15 M4gery or whatever they call it. The rifle was "evaluated" recently by the Hawaii Dept. of Corrections for possible duty adoption. I guess our guards need all the help they can get :sad: It seemed nice but really thick and doesnt look as much like a A2 birdcage FH as they say it does. But its all window dressing anyway, and does look better than a nude barrel. A better bet would be to go over to AR15.com and do a search on the Postban A2 brake by Kurt's custom. Looks much more authentic.