What is 5.56x45mm Nato?
1.
One of NATO's military firearm calibers. The 5.56x45mm NATO catridge is used pretty much only for allied (America, UK, France, Germany, etc) assault rifles.
China even uses this caliber for their T95 battle rifle.
The civilian 5.56x45mm NATO round is the .223 Remington.
See
Random Words:
1.
Seinfeld slang for a fake mechanical part used to jack up the price on your ignorant azz.
Mechanic: "You're gonna need a John..