Extending stock resembles one used in Grease gun. Additionally, there is at least one known case of deliberate self-injection with a grease gun. A grease gun is a common workshop and garage tool used for lubrication. M3 "Grease Gun" and Thompson submachine gun. The first lever grease gun, the Model 1042, was introduced during the war. M3 "Grease Gun" and M1918 Browning Automatic Rifle (BAR).