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My old (1980s with rear cocking handle and slide cover breech) 1377 wasn't pressurizing when pumping so I replaced the piston cup and valve with new ones from Crosman. I believe that I have the valve positioned correctly; threaded hole of the valve lined up with the smaller hole of the tube...

Hello, I'm new here and coming back to air guns after a number of years and need a little help. I have a Crosman 1377 and added a shoulder stock, steel breech, and cheapo red dot sight. I can't seem to sight in with the red dot sight and use the stock. The dot is all over the place and...