I've got a Crosman AS392 and its a cracking little plinking gun........... When it works!! Either the C02 cartridges discharge themselves on installation or after a few shots.... Thats still after all the seals have been replaced. Only thing I havent tried is using Crosman branded AS cylinders as I read on an American site thats what has to be used and I cant find much info on them from a UK point of view. This may just be my experience with one gun, but based on that, I wouldnt recomend them!