I just received a Crosman 1077 from a friend, it was quite rusty so I sanded down the barrel and I sprayed the plastic stock with rubberized black spray paint. It doesn't work, when you put a co2 cartridge in it it all comes out right away. I took it apart and holy cow it's almost all plastic .Can I get this thing workin again or is it even worth it? And then I'd have to do something with the barrel too. Any thoughts?