I just picked up a Banshee in 10mm and NONE of my (12) factory Gen 3/4 Glock 15 rounders will lock into the lower, but the supplied "big stick" locks in with no issues. It feels like it is hitting something in the lower and not allowing it to lock. I wanted to make sure this was 100% before I submit paperwork to SBR it.
Also wanted to build an upper in 45acp, I assume the 10mm lower will work with a 45 RDB style upper, correct?