I just pulled my first barrel and I had a problem. The barrel nut lossened OK but but hung up on something so I muscled it off thinking it was just some grime in there and I ruined the threads on the barrel and barrel nut. What did I do wrong or was it just just a bad set of threads. I just ordered a new nut for the new barrel but I don't want the same thing to happen again. Is the nut supposed to thread off the back or can it thread off the front of the barrel as well.