I bought this Crosman 150 earlier today at a local pawnshop. I had been watching it for about a year. I installed a CO2 cartridge and fired it without a pellet a couple of times. It seems fine.
a little dish soap and water will clean the grip of plastic mold i wonder about the rest i might be in the mind to just wipe it down with your favorite metal protector and leave alone, it is honest aging