I'm sure this has been discussed in far back threads but I haven't seen any recent questions.
I am having an issue with a DM7 that I recently purchased from a friend where the bolt does not cycle properly without paint in it. I'm running the gun at around 125/90 psi and when I dry fire it in single shot the bolt cycles naturally. However when it is fired rapidly the bolt either sticks forward and leaks air down the front or only partially cycles back. As it sits right now I can consistently shoot 285 with single shots and lay ropes downfield, but don't have measuring for rapid-fire velocity. It has a virtue board with a new battery and I just replaced the top hat o-ring as well as the bolt sail o-ring. Any advice is greatly appreciated as I am just now entering the Dye family.