This looks to be a hand HPA-powered airsoft gun as Comrade Quiche Airsoft tries a VZ61 GBB with an HPA-tapped drum mag at Code Red Airsoft Park... "KWA KZ61 w/ Real steel wooden pistol grip, custom drum magazine made by Alex Tatkin on 'Hopup', 'Enhanced recoil kit' by Haephestus, Evo 3 bucking and tensioner."