Now on pre-order by most airsoft retailers around the worlds is the KWA KZ61 GBB which is based o the Czech VZ61 Skorpion Machine Pistol. This has a functional bolt catch, adjustable sights, ambidextrous charging knowbs, semi and full firing modes, blowback, underfolding stock, and adjustable hop-up. In this video CRW-Airsoft test fires the GBB using the standard magazine and a long one.