9mm NATO is primarily higher in pressure than standard loads that meet SAAMI and C.I.P. standards, the bullets are primarily 123-124 grains in weight and meet NATO STANAG standards for manufacturing and performance operations to meet interchangability between different firearms used by NATO nations.
Presently U.S. made 9mm NATO must be, for the lack of a better word, "powerful" enough to be able to reliably function both pistols and SMGs that U.S. military combat personnel may be issued and using at any given time. U.S. NATO designation for our service 9mm 124FMJ ammo is M882. The only two U.S. companies that I know that makes NATO M882 is Winchester (Olin) and Federal Cartridge Co. (ATK).
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