After doing some shooting with my Slavia 634 I noticed my point of impact goes up after I shoot for a bit. I'll do some shooting, get the sight set, and then when I take it out next time it'll be shooting a good inch low. After a number (6-8) shots the POI will go up. Is this normal on an air gun? Could my sloppy oil job on the piston be to blame? I didn't think an air gun barrel would get "hot" from repeated shots. What the heck!




















































