I Have This Old Gun: U.S. M3A1 Grease Gun
The M3A1 Grease Gun, a WWII-era submachine gun, was developed as a cheaper, simpler alternative to the Thompson. Its design evolved to the M3A1, removing the crank handle for a finger hole cocking mechanism. Originally inexpensive to produce, registered M3A1s are now rare and costly collector's items.









