his Umarex H&K Heckler & Koch USP GBB(KWA) BBs Blowback Airsoft Pistol works with green gas. This Airsoft Pistol features the efficient use of the green gas! It reaches maximum velocities of up to 300 FPS (using .20g BBs). The airsoft pistol also features a full metal slide with a high strength polymer frame. T
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