BB, I hope RRA is able to solve this problem, it's a shame to have this much trouble. Fingers crossed that the new mags correct this.
I wonder how far RRA will go to fix this. It seems they should test it out with with different uppers and lowers on their end, and get it to run 100 rounds trouble free before returning it.
Thank you for keeping us updated and let's hope you have good news with the new mags!
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek