I was hoping that the issue was out of spec takedown pins but after I determined it wasn't, I tested every lower I have: DD, PSA, Anderson, ADM, Mega Arms, CMMG, S&W, and of course BCM.
I can only insert the pins about halfway into the channel before they get stuck every time, and then I have to hammer them out from the left side of the lower with a punch in order to remove the pins. Again, this happens with every lower and front takedown pin I have.
Anybody have any ideas about what I can do to solve this? I've never had a BCM product that wasn't perfect before.