The Nitro Piston Technology has proven to be a valuable aid to hunters. There"s nothing worse than knowing your metal spring might be fatigued and not provide the power and energy you need to humanely dispatch your prey. With a gas piston, you"ll always have the same power and never have to give it a second thought because the gas piston does not suffer from the same issues. Get either the .22 Crosman Nitro Venom Dusk to shoot spinners, pop the heads off dandelions, kill tin cans or dispatch small garden pests. If you shoot raccoons, possums and ground hogs, it"s best to use the .22 Caliber for best results.