Umarex M1A1, C02 Air Rifle, 177 BB, 435 Feet Per Second, Full Auto, Matte Finish, Black, 30 Round 2251820 Pick up more than history when you pick up the full-auto Umarex Legends M1A1! Not only is this one of the coolest historical replicas done, it feels right, it looks right, and is guaranteed to be a crowd-pleaser. This open-bolt wonder features a 30 round magazine that houses (2) 12-gram CO2 cartridges and is equipped with sling mounts for your favorite historical sling. You may recognize this historical gun shape from wartime history and the big screen (movies).