Failure to lock back, failure to feed
I posted about my buddies 18in Rifle gas SS410 upper awhile ago on some issues it was having.
We have it narrowed down to not locking back/or feed the next round with ANY ammo. Handloads, XM193, XM855, any ammo will not lock back or feed.
Doing the 1 round in a mag test for locking back and 2 in to see if it will strip a round off, it will not.
I'm assuming this is a gas issue. The gas port is at .096 currently. We tried different lowers, different buffers, different buffer systems, different buffer weights and it still wont work.
What is the next step?