I've owned many springers, RWS, Benjamin (marauder), Gamo, and most recent Beeman R9, these were all get with open sights but when I try to add scopes to them they do not stay consistent or hold zero. I think it's because of them being break barrels and to much movement. Never owned a PCP and don't know where to start in purchasing pumps but just want the most consistent 177 cal for shooting sparrows while I sit retired on my porch... Please give me some insight on a 177 wood, fixed barrel, and most consistently accurate pellet gun with rotary clip so I can be the sparrow whapping king.