I recently installed a 720pp and Powe Block on my MK2 Impact and have lost a lot of power after the install. Originally the rifle was a pre Power Plenum MK2 and i added a drop down tube on the bottom of the rear block to add more volume and I was getting great speeds and consistency with the 28.5gr NSA slugs (960fps) with a 600mm .22 barrel.
After the installation of the 720pp and Power Block kit I am having trouble getting the 28.5gr NSA slugs about 930fps and the power drops off when you get the reg about 130bar.
I swapped out the valve return spring that came with the kit and installed the lighter spring that comes in the Slug Power Kit which helped a little, but still kot getting consistent FPS and not getting about 940 FPS.
Anyone have any issues when they installed the 720PP kit on a MK2 Impact??
After the installation of the 720pp and Power Block kit I am having trouble getting the 28.5gr NSA slugs about 930fps and the power drops off when you get the reg about 130bar.
I swapped out the valve return spring that came with the kit and installed the lighter spring that comes in the Slug Power Kit which helped a little, but still kot getting consistent FPS and not getting about 940 FPS.
Anyone have any issues when they installed the 720PP kit on a MK2 Impact??