As Paul mentioned, you're likely not going to get the BJ into the UCA without removing the anticorrosive coating on the threads of the BJ. I nearly broke my bench vise off the bench trying. Then needed to heat it and hit it w/ an impact gun to get the BJ back out. Once you wire wheel the coating off, it screwed right in. It was at this point of my build that I realized that I should slow down and read a few build threads to catch some tips not mentioned in the "manual", and believe me, there are a lot of them.