The M3A1 Grease Gun: A Desperate Gun for Desperate Times
A soldier’s connection to his equipment is an odd bond. As a warrior your very life might hang on the effectiveness of your gear, and you need to believe that the equipment you use is the very best your nation can produce. In no other aspect of military service is this axiom better exemplified than in the case of a soldier’s personal weapon.
The Second World War was the most expansive conflict in human history. Never before or since have so many combatant nations tried to resolve their differences on the battlefield. At a time when Total War demanded every measure of effort industrial, economic, and spiritual that a nation might muster, the United States attempted to produce a quality submachine gun that was both effective and inexpensive while remaining amenable to mass production.
The Grease Gun
The original M3 Grease Gun was adopted in December of 1942. In its original form, the gun was intended to be disposable so spare parts were not stockpiled. The M1A1 Thompson it replaced costs $42 at the time as opposed to $18 for the M3 and $9 for the even more utilitarian British Sten. To grant a bit of perspective, in today’s dollars this is $554, $237, and $118 respectively. By December of 1944, a number of deficiencies had been identified and corrected, and the definitive M3A1 was rolling off the lines. This variant of the gun served as personal armament for tank crews well into the 1990s.
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The M3A1 was comprised of two stamped sheet metal halves welded together. The heavy bolt rode on twin guide rods so the internal geometry of the receiver was not terribly critical. The original M3 cocked by means of a ratcheting sheet steel handle that was wont to bend and break under hard use. By contrast, the M3A1 cocked by means of a simple divot in the bolt. Any handy human finger could cock the bolt easily. The pivoting dust cover incorporated a blocking device that locked the bolt either forward or back and served as a rudimentary safety. The wire stock could be removed and used as a handy magazine loader to pack 30 .45 ACP rounds into its double-column magazines that tapered to a single column for final feeding.