RST got this video showing the newly released KTC TEC-9 Gas Blowback SMG to check how it fires. The upper receiver of the KTC TEC-9 GBB SMG is made of steel, while the outer barrel, bolt, and charging handle are aluminum. The lower receiver is polymer. It uses green gas as a propellant and has a 55-BB gas magazine. It can shoot at about 312 fps when new.