Had it out this morning. Put 50rds through it(was working on some pistol stuff at 25m so just wanted to see if the gun would run).
Worked well, Pmags dropped free, although occasionally the bolt release was a little hard to press. Wasn't paying attention to see if it was with the 20 or 30rd Pmags, or if there was a difference.
The only issue was the trigger pin started walking out of the gun towards the end of 50rds. I didn't notice until i put the gun down after shooting, and decided to park it. Didn't take much to tap it back in, but I might end up looking for KNS Non-rotating Trigger/Hammer Pins to keep things from moving around and f**king up the pin holes.
Don't know if it's an issue with DPMS LPK's, or something that just sometimes happens. But KNS parts should solve the problem.