Spring or gas firing system? Each types work via a piston that compresses air then releases it with every set off squeeze. The differences would be the types of compressors that they use to power the piston. Spring-powered guns have a spring system in place, when gas-powered guns depend on https://gunsforsaleinwv10987.signalwiki.com/1436110/top_latest_five_gun_jokes_urban_news