M3 Submachine Gun

The M3 (1942) Was a submachine gun developed by United States of America during WWII as a cheaper substitute for Tommy Gun. Due to its format was nicknamed "Grease Gun".

A version with silencer of M3 was also used during Vietnam War by teams of Navy SEALs.

History & Design
When WWII began submachine gun Thompson was the standard of the United States of America. However, Thompson was more costly in terms of time and production costs, compared to other machine guns. Other new models of Thompson had greatly reduced the cost of production (eg the M1928 against M1A1), but a new design could lower the cost even more. The basic concept of a new weapon, cheap and designed for mass production has its origins in Chauchat World War I, the submachine gun produced most of the war. The .45 caliber M3 was introduced in 1942 and is specifically designed for a simpler production used no metal parts stamping. Similar efforts to produce a submachine gun on low production costs were made by Great Britain (Lanchester and Sten) Germany (MP34), Etc ... The Soviet Union, France And Italy would also develop weapons cheaper in 40.