I'm not doubting your problems.
I was involved in a training program for our department, newly created Patrol rifle Program which involved 5 tow-day classes. We shot up over 50,000 rounds of the new Q3131.
All guns were new 16" Bushmasters.
I was on the firing line the entire time. I am only aware of 5 bad rounds. Casemouth slightly crushed about 1/8th in causing the round to not fully seat. We would have 1-2 cases of ammunition out of the boxes and dumped back into the cardboard case at any time (easier for 15 students to load up), so I can not tell if all of the bad rounds came from the same box/case. But the problems all showed up in the same afternoon...
Our initial purchase of 65,000 rounds does have the same lot#.
Once again, I am not doubting you had problems, but I have to say that from what I personally observed, I have no problems with the Q3131 loading.
Beat Trash