There are no dumb questions , PCP stands for PreCharge Pneumatic. , just like SSP is single stoke pneumatic( like a Daisy 7474 pistol or a953 rifle) , and MSP Multi Stoke Pneumatic ( like a Crosman 1377 pistol). I think I'm right; if not someone will point me in the right direction. We're all here to learn, at least I am anyway. kirby