M3 "Grease Gun" Submachine Gun - Technical Illustration & Historical Overview #127081 (License: Personal Use)

This black-and-white technical illustration depicts the U.S. M3 submachine gun, nicknamed "Grease Gun" for its resemblance to a mechanic’s tool. Key features include a stamped sheet-metal receiver, a retractable wire stock, a perforated barrel shroud, and a vertical foregrip for stability during automatic fire. Designed in 1942 as a low-cost, mass-producible alternative to the Thompson, it saw service from WWII through the Vietnam War.

Used on military history websites, firearm encyclopedias, museum exhibits, and educational resources about 20th-century small arms. Matches user intent for researching WWII weapons, technical schematics, or comparing submachine gun designs.