My mag wont stop breaking paint!

here's the setup and ive clearanced the carbon fiber and got a new prophecy loader thats set up on its highest speed.

the body is heavily modified and ive noticed a couple sharp spots that have been polished and smoothed over.

switched to a larger bore barrel retuned the lvl 10... twice... but at this point im open to anything

EDIT: after the video, a good cleaning and a new hopper with fresh batteries I tried again. 3 balls broke in a row and then I had bolt stick... when i say bolt stick... the bolt was all the way FORWARD!