I have a Smith and Wesson M&P40 6MM .177 Caliber BB pistol
purchased at walmart for $70 I believe
It's a nice little BB gun but today when i was shooting I went to replace the CO2 canister (12g) and when I put the other one in when it punctured the seal it hissed like it was being taken out instead of being put in. my roommate says there is a problem with the O-ring i dunno if hes right though. The seal is obviously messed. should I just buy another mag for the gun? or is there a way to fix it?> and what caused this problem?