As always, a quick review by Airsoft Chay as he covers the VFC H&K UMP45 Gen 2 GBB SMG. The Umarex H&K UMP SMG Airsoft Gas Blow Back GBB Rifle boasts a reinforced ABS body and a functioning cocking handle. It comes with a 30-round magazine and offers versatile features such as a foldable stock, adjustable rear sight, and the ability to effortlessly switch between full automatic, 2-burst, and semi-automatic modes.