So tried my acr and all mags run well, pmags, lar mags, atrs mags, and metal 5/10 aa beowulf mags.
all types of 223 ammo are fine, runs well.
My problem is when I am running xm855 556, i get stovepipes jams every 5 rounds or so.
I have the S/U regulator.
Its not really a big deal since I can just run 223 ammo in it, a few guys on the acrforum ran into the same problem, got the h/l regulator from bushmaster and are running their 556 on H to solve this issue.
I was wondering if any of you ran into this problem?