Umarex M3 Grease Gun, CO2 Rifle, 177 BB, 415 Feet Per Second, 60Rd 2251822 Ripping through a 60-BB magazine in about 3 seconds will put a smile on almost anyone's face! The Umarex Legends M3 Grease Gun full-auto BB Gun is based on the venerable M3A1 variant introduced in 1944. Replicating the basic look and feel of the original, the Legends M3 Grease Gun features a drop-free, 60 BB magazine (which houses the two 12g CO2 cartridges for power), a flip open dust cover, a "thumb" cut-away charging slot in the bolt, a three-position manual safety, a collapsible wire stock, and peep style sights just like the real deal. With a cyclic rate of 1050 BBs per minute (17 BBs per second) a full magazine will empty fast, so you should probably get some spares. For full-auto fun, without all the hassle, the Legends M3 Grease Gun BB Gun is ready to rock and roll!