WWII "Grease Gun" from General Motors. Practical combat firearm manufactured by General Motors. On today's Curator's Corner, National Firearms Museum Senior Curator Phil Schreier joins John Popp in the studio to present the World War II-era M3, popularly known as the "grease gun." This early model has a cocking lever on the side that was eliminated in later builds, and handy features such as a detachable shoulder stock that doubles as a barrel cleaner. The M3 ceased production after the war, but it remained in the U.S. Army's inventory until the 1990's. Originally aired on 8/13/2009.