Introduced in 1935 and based on the French "Brandt" mortar, the M1 was a primary indirect-fire infantry weapon through World War II and into the 1950s. The M1 operates on similar principles to the WWI Stokes Mortar, where rounds are muzzle loaded and allowed to drop on a fixed firing pin, a setup that is extremely robust, highly effective, and permits an impressive rate of fire. The main tube and endcap are finished in green, with the endcap bearing the maker's marks and serial number. The baseplate and bipod are also finished in green, with the bipod bearing a brass E.B. Co. data plate on the windage adjustment mechanism and fitted with an M4 sight.

Very good, with traces of green paint finish concentrated on the endcap, with a mixed patina overall, patches of shallow pitting on the tube and some grind/polishing marks on the endcap. The bipod and baseplate show mild wear and tear, with the M4 sight damaged. Mechanically excellent. NOTE: This Destructive Device is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479, National Firearms Act.