The Umarex Legends MP 40 CO2 Air Rifle is a replica of the MP 40. The Legends MP uses two 12-gram CO2 cartridges to operate in either full-auto or semi-auto modes; maximum velocity is 450 fps with .177 metal BBs. The detachable magazine holds 52 BBs. Realism is enhanced by the full metal body and folding shoulder stock. The hooded front sight and adjustable rear sight stay true to the original design. The Legends MP 40 CO2 Air Rifle is a faithful replica of the original that's fun to shoot and fascinating to own. Replica of the MP 40 Operates in either full- or semi-auto modes Uses two 12-gram CO2 cartridges Maximum velocity is 450 fps 52-round magazine Realistic metal body Folding shoulder stock