Alright I have a problem with the AR-15 I built so I'm going to try to describe the problem and hopefully someone can help me out. I got the headspace checked and it was fine so I took it home and fired it. It fired fine, the bolt came about 3/4 of the way back but right before it ejected the shell it got stuck in that position. I hit the forward assist and the empty cartridge went back into the chamber and got stuck. I tried pulling the charging handle but the bolt only moved about half an inch. I had to take the upper off and then put my cleaning rod down my barrel and into the empty cartridge and then tap it with a hammer to get it dislodged. Then I put it back together, put a full magazine in it, chambered a few rounds and ejected them. No problems. It functioned just like it was supposed to. The only problems I have is with a fired cartridge. Does anyone know what's wrong? Any help will be very appreciated.