The M3 submachine gun was an American .45 caliber weapon that was adopted for the United States Army during WWII. Designed to replace the Thompson submachine gun, the M3 was cheaper, lighter, and more accurate. It’s commonly referred to as a Grease Gun, due to its visual similarity to the mechanic’s tool. It was manufactured by General Motors and cost about $20 in 1943.
Weighing 8.15 lbs, the M3 had a barrel length of 8 inches and an overall length of 29.8 inches. It was able to fire 450 rounds per minute, which was rather impressive for WWII era weapons. It had an effective range of up to 100 yards. It featured a detachable flash hider, which saw a lot of action in combat due to frequent night engagements.
The M3 used a 30-round magazine, which most soldiers disliked. It was difficult to load by hand and was easily jammed by mud, dust and dirt. However, the Army liked the gun and ordered a slight variant of the weapon – the M3A1. The new version took care of most of the problems that soldiers had experienced.
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