KWA's lineup of Gas Blowback sub-machines are one of a kind, whether to serve as a reliable secondary weapon or your CQB primary weapon, no one tops KWA in performance and power. One of the very few airsoft companies and manufactures that offer gas blowback SMG's, KWA alone has brought the popular MP7, TMP, and Mac-10 in gas blowback realism and power. Gas blowback SMGs, like they're pistol counterparts, are powered by Green Gas, a propane mixture, that is usually filled into the magazine allowing for semi-automatic and full rip-roar of fully automatic fire. On top of that KWA utilizes their patented NS2 system blowback system, for one of the most efficient in gas consumption to FPS ratio. Combine by that by their excellent service and support center, this is the way airsoft should be played.