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M14-M1A
M16-AR15 and variants
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I'm not sure about the AR-15/M-16 variants as I don't think there were any produced before the current date in 1962. The M-14 would qualify, but only if you could prove that it was pre-current date, 1962 production.
There are also a number of shotguns that were issued to U.S. troops and, of course, there is a myriad of U.S. .22 training rifles.