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Hi Terry, this has a spring piston powered action and launches .177 pellets to 360 fps. You c0ck the gun one time for each shot as seen here >>> https://shopruger.com/Ruger-Mark-IV-177-Air-Pistol/productinfo/17829/ Stay safe & have a great day!

Hi Terry and welcome. Break Barrel Spring Piston operation as demonstrated here at 1:40 - https://www.youtube.com/watch?v=ir3-XDWj6ic --------- Cheers, stay safe and enjoy!

No Co2, it utilizes a spring piston action.