New Hatsan Flashpup .22cal

The machine work inside the receiver is really ruff. Take the gun apart, wrap 150 or 180 sandpaper around a wooden dowel or something you can chuck in a drill to smooth it out. Molykote grease is 65% molybdenum sulfide in a silicone grease carrier so it's safe for o-rings and it's really slick and long lasting. You can even put some on a pellet and shoot it after cleaning the barrel. It keeps the barrel from leading.