hi need help. i have a mkp2 kit and it seems to be choping in the barrel. every 4 or 5 balls. check for berr's. used over size barrel. change the acorn the barrel screws into. im useing valken paint graffiti. im useing a box mag. not getting paint in the feed tube from the box mag. a little paint in the ball chamber but mostly in the barrel. used the barrel and box mag on my a5 mag kit work fine. useing a techt bolt rubber nose. please help.