I purchased this barrel for my CZ P09. Needed to Dremel the notches for which the barrel sits in the housing. I have the extended threaded outer barrel, otherwise this barrel will come out of the standard outer barrel. Anyways, once fitted, with a Maple Leaf Decepticons 50 degree bucking, I'm hitting as well as my AEG which has been upgraded with all shit available. This barrel works wonders, boosts your joule and FPS but still around 1 joule and is an absolute beast. I highly recommend this.