NATO 7

Slang term for the 7.62x51mm NATO rifle cartridge. NATO 7 is not for use with gun nuts, as they will freak out like a coke head given powdered sugar as a present.

Doesn't the H&K G36 shoot NATO 7s?
No dude, NATO 5s.

NATO 7 by Nikolas Glock November 4, 2009

7.62x51mm NATO 

One of NATO's military firearm calibers. The 7.62x51mm NATO cartridge is often used in allied (American, UK, German, French, etc) machine guns, sniper rifles, and even a few assault rifles (such as Heckler & Koch's G3A3).

The civilian 7.62x51mm NATO round is the .308 Winchester.

7.62x51mm NATO by Dave February 1, 2004