Yes it does, unless your barrel is stamped .223 .
5.56 and 223 cal. are the same cartridge...........
if it is a 223 cal, then yes
probably years. shoot it, if it fires it's good
Of course you can. The .223 is the civilian version of the 5.56x45mm NATO ammunition. They are slightly different but the difference is constantly neglected due to the fact that it is safe to shoot. Hope this helps.
NEVER FIRE AMMUNITION IN A WEAPON THAT IS NOT CHAMBERED FOR IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Danger, Danger, Danger
No. They have matching dimensions, but differ in other areas, such as neck angles. .223 ammunition can be safely fired in a 5.56x45mm chamber; 5.56x45 ammunition is not recommended to be used in a .223 Remington chamber.
The equivalent of 5.65 mm ammunition is .22 caliber ammunition.
you can fire both 5.56 and .223 ammo in a rifle chambered in 5.56...but not the other way around! In a rifle marked .223, you should fire .223 ammo only
Only if it is marked ".223 Remington" on the barrel.
Yes - this is the same ammunition No, it is NOT the same ammunition. The AR-15 has a 5.56x45 chamber, and it will be marked "5.56" on the barrel. Many imported firearms which have a 5.56 chamber will be marked .223 in order to be classed as "sporting rifles" which may be imported. The .223 Remington cartridge may be safely cycled in a 5.56x45 chamber; the 5.56x45 cartridge is not safe to cycle in a dedicated .223 Remington chamber. When it doubt, always check with the manufacturer - they are the most authoritative people to talk to on these matters. The civilian .223 Remington and military 5.56x45 cartridges are similar in dimension, but differ in case thickness, chamber pressures generated, and neck angles. The chamber pressures of the 5.56 greatly exceeds that of the .223 Remington, and the different neck angle can prevent proper headspacing from being achieved in a .223 chamber.
5.62mm I believe.
Stored in moderate temperatures and low humidity, ammunition can be stored for decades.