I have a ruger charger that I put a threaded 6" kidd bull barrel on. I have a friend who got his spectre can in that he has been shooting on a savage bolt .22. I asked if I could see what my charger would sound like suppressed but when I went to put the can on it threaded smoothly for two to three turns but then was difficult. I didn't want to mess up threads on my barrel or his can so I didn't force the issue and just took it off. The suppressor goes on smooth on his rifle as well as my thread protector but something is up with my barrel threads I believe. There doesn't appear to be any burrs on it and it threads my protector on easy but this won't work when my suppressor finally does show up. Any ideas ????