Stu goes over the Umarex Beretta PMX GBB SMG in this Patrol Base video. The PMX boasts ambidextrous controls across the design, a high density polymer upper and lower receiver with an aluminium sub-receiver, ambidextrous steel sling points and the front and rear and a rock solid side folding stock which combines the best aspects of other folding stock designs. The highlight of the PMX is its gas blowback action, providing immersive recoil with each shot and a 100% realistic manual of arms, meaning racking the charging handle before the first shot and hitting the bolt catch after a satisfying reload.