Use only Walther 88-gram CO2 cartridges. Other cartridge brands don't have a long enough neck & won't reach the piercing pin. Your gun will not function unless you use the Walther brand. Walther SG9000 airsoft shotgun 88-gram CO2 tank (up to 700 shots from one tank when shooting BBs singly) Semi-auto Double-action only 40-shot mag 3-shot burst or individual BBs Integrated Weaver/Picatinny rails Click on the AMMO link to see our recommended airsoft BBs. Find 88-gram CO2 cartridges and other shooting gear by clicking on our ACCESSORIES link.... ... Walther SG9000 CO2 airsoft shotgun with clear stock. Uses a Walther 88-gram CO2 tank (do not use any other brand). Shoots BBs one at a time or in 3-shot bursts....
