Johnny Peppers; U.S. carbines (yes, I know some carbines were blued) and rifles were Parkerized/phosphated through the M-14. Many parts on M-16s, including barrels, are still manganese phosphated. This process will probably be in use by the U.S. military for many more years.
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You can lead 'em to the water, but you can't make 'em drink.
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