The Umarex Legends Line is now rocking the legendary M3 Grease Gun. The Legends M3 Grease Gun from Umarex Airguns is based on the M3A1 variation used from 1944 and beyond. Underneath the dust cover resides the bolt and its cut-away thumb charging slot. This blowback action SMG does fire from the open bolt just like the M3 firearms did.Specifications and Features: .177 Caliber BB Single Shot or Fully Automatic Operation 1,050 Rate of Fire (2) 12g CO2 Power Source Blowback Action Hinged Dust Cover Fixed Iron Sights Collapsible Wire Stock Drop Free 60 Shot BB Magazine