A friend of mine gave me a RR 9mm upper to try out, it wouldn't fit his bushy lower for some reason. I tried it on my RR lower, and low and behold, the same problem. The bolt won't return all the way forward. Neither of us have any experience with 9mm uppers, is this normal? are we doing something wrong? is there a release for the bolt?
Please help, I can't remove this upper because the bolt is locked back into the stock. How can I remove the upper? And what needs to be repaired?
Thanks