I had two issues, the first one was a lost instruction manual but I found it. The second issue is the rear hellfighter pin. I found it difficult to operate like as in I was unable to operate it. I took it to a gun shop and the worker after looking at a video and struggling with it finally got the rear pin out. And then it was even more difficult to get it back in. My question would be is this supposed to be this difficult, is there something I'm not getting right about this rear pin, or could something not be right ?with it?i