The KSC CZ Vz61 Heavyweight Gas Blowback SMG gets reviewed by the Red Army Airsoft Club. Now available at Airsoft-Rus, this GBB SMG is a System7 Japan version and has a Polymer Body, Outer Barrel and Grip. It has a quick detach Steel Folding Stock and comes with a 20-round gas magazine as part of the magazine. Watch Alexander below as he says what he thinks about this product: