.223

=Overview=
The .223 cartridge is a slightly smaller bullet than a 5.56, and is compatible with all 5.56 guns. It does 90% of the bullet damage of a normal 5.56 in a 5.56 gun, but you can carry more.
It is useful for LMGs such as the QBB or M249, and not recommended for DMRs chambered in 5.56, as they rely more on damage than firepower. 
To not shoot .223 when you have 5.56 is standard, and only once you run out of 5.56 will the gun shoot .223. 
There is a 30% chance for a 5.56 gun to spawn with .223 ammo.