Hi guys, I'm brand new to the forum so if I do something stupid please forgive me. I just recently built a JD 308 with dpms bolt, buffer, spring, and SASS barrel. I took it out to break it in with a couple of 20lr pmags but it FTF about every other round and after searching around I read the pmags were a no-go for the JD. Mine was showing extreme wobbling and would work by holding the mags like others, I was disappointed but I decided to try a dpms mag. It did the exact same thing, so I took out the calipers and measured the magwell of mine as well as another that was ordered at the same time, both measured out at 2.965. So my question is, before I send it back to JD: are these receivers that out of spec or am I having a buffer/timing problem? Any measurements of properly functioning dpms magwells would be helpful to me to properly troubleshoot this issue! Thanks Drew L.