This is a nice barrel extension, but you have to get it on right. Seeing as there are no instructions with it you are left guessing. Do not take it apart before you put it on your barrel, and make sure you have it fully seated on the barrel. I had some odd accuracy issues when shooting. Then redid everything and it seemed to fix the issue, but I'm going to monitor it going forward.
UPDATE: So it has gone back to not shooting properly, if I take the "can" off it is fine with the muzzel break. Once the can is on it seems to hit the side as it is leaving and there is BB shavings in side the can again. I'm going to talk to customer service about it and see what can be done, will update.