Alright i just got a J&J barrel kit from potatoboy. I tried to put it on my automag and it gets stuck. I have a hopper right minimag body. I can see the barrel in the "vents" on the body and it seems to fall about an inch short. There is nothing obstructing it from moving and i don't have this problem with any of my other barrels. Anything i can do so it will fit on my gun!