I have had a few problems with my DM9. It is new with only a case through it so far, it will start firing fine then velocity will half then eventually the balls won’t make it out the barrel. Even with a few seconds between shots it doesn’t get better. I have the lpr on 3 ½ turns out and when I tried to increase the velocity it is adjusted all the way out on the hpr and I can’t get it higher than about 250 fps. It has a new battery installed and the bolt has been lubed. i have heard that there may have been a mix up in the factory with the shims in the hyper 3? how many should there be as the manual doesn't explain this? Any help would be great.
