Airsoftjunkiez quicky demonstrate their Custom SMC9 that comes wit the Primary Airsoft SMC9/GTP9 HPA/M4 Adapter with mag making it an HPA-powered SMC9 carbine. The SMC9 carbine is the carbine kit that comes complete with the G&G GTP9 Gas Blowback Pistol. The Adapter is available at their store and more custom HPA airsoft guns as well.