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Like the title says the the US Army chooses the colt monitors rather than the M1918A2 and the model 1923 Thompson chambered for .45 Remington Thompson, the latter was never advertised as replacement for the BAR just a more powerful Tommy gun.
Just how would the colt monitor and model 1923 have faired in combat?
What kind of variants would there be of both weapons?
How would the higher velocity R.T .45 be received by the US military and would still be in use today?
How much more reliable would the colt monitor be and just what kind of beneficial improvements would it had by Korea and Vietnam?