Does any body know where I could find parts for an old Crosman model 105 pumper? It was my gandmother's, so it's got some sentimental value, on top of being just an great little starling gun. Not long after I inheritted it, though, the rear sight went missing while on a walk around the back of our property, and I can't find one anywhere. I found a good piston rebuild kit on mac1airguns, but they don't carry any sights for it except a scope rail that is just pointless overkill on a pistol this old and lightweight.