M3 (Grease Gun)

History of the M3 (Grease Gun)

The M3 "Grease Gun" was an economical submachine gun weapon developed during World War II (1939-1945) to arm a large number of incoming U.S. troops with the same number of small arms. The M3 appeared in large numbers in 1943, a timely successor to the excellent but expensive (and complicated) M1 Thompson ("Tommy Gun") line of submachine guns.

Design work on the new submachine gun began in 1942 and production ran from 1943 to 1945, with approximately 700,000 eventually produced.

The nickname "Grease Gun" was eventually given to American soldiers, who likened its general appearance to a mechanic's grease gun.

In fact, the general appearance of the weapon is tubular and cast in large parts to minimize the number of parts required. The pistol grip is on the rear of the receiver as usual, and a wire can slide out of the side of the receiver to provide a makeshift stock. The trigger unit (solid trigger assembly) is located under the receiver and in front of the pistol grip as usual.

Little ergonomics are offered to the shooter - the M3 is certainly a useful weapon. The magazine fits snugly in front of the receiver and accommodates a straight, detachable magazine that can also be used as a foregrip (like the German MP38/40 submachine gun series). The barrel is a simple cylindrical component placed in front of the receiver.

Sighting devices are placed on the weapon to give the appearance of precision shooting, but the core of the submachine gun has always been a short to medium range weapon.

A variant of the M3 series became the "M3A1", which was an evolution of the design. It inherits the original, which entered service in December 1944, and its main purpose is to further simplify production processes and practices to simplify the final product and deliver weapons in wartime quantities. Furthermore, this revision stage allows for a revisit to correct some of the original flaws. Because of this, the M3A1 features a redesigned bolt retraction mechanism that forces an increase in the size of the protruding upper flap, allowing the user to stick their fingers into the grooves and pull the bolt back as needed.

In a further attempt to make the weapon more versatile and more "battlefield friendly" - an oil reservoir was also built in the pistol grip to lubricate components on the battlefield, and various parts of the operating system were redesigned to Used as a tool when dismantling weapons into exposed parts.

All in all, the M3A1 wasn't much of an improvement over the original M3, neither system gained any level of soldier acceptance or resemblance - instead they preferred the reliable M1 Carbine and M1 Thompson, Because of their sheer reliability and stopping power. Nonetheless, the M3 series went into extensive combat service at the end of World War II, and the series was used extensively during the Korean War (1950-1953).

In addition, foreign militaries are also producing outside the United States, eager for cheap, tried-and-true weapons that are still durable and fairly easy to use.

The M3 model is manufactured by the Guide Lamp Division of General Motors in Detroit, Michigan and the Ithaca Gun Company in Ithaca, New York. Some M3 models include unusual additions such as muzzle-mounted flash suppressors. Argentina refers to its M3s as "PAM1" and "PAM2". The PAM1 is known to be loaded with German 9x19 Parabellum pistol cartridges, while the PAM2 is equipped with a grip fuse.

Also mentioned is a suppressor model (described in detail elsewhere on this site) that adds an oversized component to the barrel to reduce "breaking" of fired bullets in covert operations.

Specification

Roles

STRUCTURAL

PERFORMANCE

VARIANTS