Based on the legendary M3A1 Submachine Gun used by American troops from 1944 until the 1990s, the UmarexA(R) Legends M3 BB Gun delivers a ton of full-auto fun. Powered by (2) 12-gram CO2 cylinders, the M3 BB Gun is capable of emptying a full 60-round mag in just seconds. Of course, you can flip it over to semi-auto mode if you want the fun to last a little longer. It fires from an open bolt just like the original SMG did, and comes complete with a collapsible wire stock, fixed peep-style sights, and a 3-position manual safety. For backyard fun, you can't beat it. Based on the M3A1 "Grease Gun" SMG Semi-automatic or fully automatic action Capable of firing 1,050 BBs per minute Can dump a full 60-round magazine in just a few seconds Up to 450 FPS velocity Operates on (2) 12-gr. cylinders Realistic blowback action Fires from an open bolt Collapsible wire stock Peep-style iron sights Includes (1) 60-rd. magazine