Quote:
Originally Posted by .45cultist
With the right twist, quite a while depending on the firearms laws and culture of each state. Also Federal sells excess Lake City ammunition per their contract with the Govt.
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As .45cultist has stated, the rifles manufactured post-2014 (after the 1994 Assualt Weapons Ban expired) usually have a 1 in 8 twist rate to use both types of ammunition as well as the appropriate chamber dimensions. Those .233 Remington and 5.56N rifles made before the Ban had TWO DIFFERENT chamber types. The older rifles designed around the .223 Remington and older M193 Ball round used a lot looser twist (1-in-10) and the NATO 5.56mm round (M855) requires a tighter (1-in-7) twist. To add to the issues, the M855/SS109 round had a "microscopically" larger case mouth (due to the higher pressures produced) that would "expand" into older rifle's bores and jam them. When you put older ammo (M193 Ball) into newer rifles, that ammo wouldn't reach the same ranges or possess the same accuracy as the newer ammo. To make sure there was less "confusion" about the difference between the two ammo types, OLDER RIFLES (designed for M193) were now being designated as .223 Remington ammo rifles while the rifles designed for M855/SS109 were designated as 5.56mm NATO rifles. Any NATO designated rifle CAN fire all .223 ammo. Just reduce the weapon's base range by 5 meters. Firing M855 in a .223 Remington chambered rifle will create a JAM if the user rolls OVER the rifle's WEAR VALUE. This roll MUST BE MADE after every Initiative Step's/Attack's worth of fire. A failure by more than two on this roll will mean a Level 2 malfunction.