This tiny but mighty GBB machine pistol from Maruzen gets a thorough inspection by Mach Sakai. The Maruzen Vz61 Scorpion is a gas blowback submachine gun that packs a powerful full-auto punch in a compact, sidearm-sized body. It features realistic functions like a hold-open bolt after emptying the magazine, and simple field stripping for maintenance by just removing the hinge pin.