The .45 caliber M3/M3A1 are far easier to manufacture than the Thompson, and have a number of excellent design features in addition. The low cyclical rate of fire makes the gun easier to control than most submachine guns, not only the Thompson. The weapon's straight line of recoil thrust also adds substantially in controlling the gun in automatic fire. The gun's loose tolerances allow for reliable operation even if very dirty and, with its bolt and guide rod design make it more reliable than the Thompson under adverse conditions.
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