Originally Posted By jason_dunbar:
i want to know what the difference 5.56 mags to 6.8spc mags? do they have different followers and springs?they all fit in a AR lower so they cant be much of difference and why cant you use Pmags?i might be beating a dead horse or just a idiot but i still want to know
The biggest issue is the diameter of the round sis different, the 6.8 is larger.
The difference between the mags is the feed lips have been adjusted to accommodate the larger round.
There is also some internal differences in the stamping so the 6.8 rounds sit properly in the magazine.
I have read about people successfully using 5.56 mags to feed 6.8 but I'm not sure if I'd trust it.