National Postal Meter, Rochester, NY. was one or the 10 contractors to produce M-1 Carbines for the government during the war. They produced 413,017 carbines until stopping production in 1944 at the end of their contract.
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The best medicine on the battlefeild is fire superiority.
When you see one, you will notice that the barrels are always made by someone else. NPM never made their own barrels, so don't think someone switched it.
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Just because you're paranoid doesn't mean that they aren't out to get you!