Nuke Airsoft reviews the KWA B&T MP9A1 Gas Blowback SMG which has been in the market for several years now. The A1 version has a folding stock and integrated foregrip with the whole body being made of reinforced fibre polymer. Magazine has a capacity of 48 BBs and the hop-up is adjustable... "The KWA MP9 has original B&T markings and scores despite its heavy price tag provides top of the line performance."