I contacted Knight about the blow back on my boy's new woverine 209. It wasn't real bad but I thought I would see what they would say. They are sending a stronger spring and a breach plug(their idea, not mine). We talked about stretching the spring a little till the new one arrived. I stretched it about 1/2" and we shot the gun today about 20 times with no blow back. A great rifle from a super company :grin:. Don