As you know, I recently got the ir-hop. I just got it tuned, but every time I took it out of my gun and put it back in it would have different degrees of backspin (as in degrees on a protractor). One Time I put it in It would fly off to the left, then again and it would go right. I found out the barrel is able to turn somewhat inside my bucking, and with the ir-hop pretty much attached to the barrel, I have to have the barrel centered perfectly. I have been fixing this by taking off the muzzle cap and using needle nose pliers, manually turning the barrel to center it. Is there any way to get the barrel centered without having to do this? (Sorry for no paragraphs, the key broke on my keyboard).