If Crosman has any of the Optimus wood stocks (part#CO1-K77-01-00) or Vantage (part#B19-2x-C-01-00) in the parts department, they are B19 based guns and would fit with a little work. The breech plug area would need to be trimmed out to fit the larger Gamo plug, the trigger is the same and the front action screw holes are very close but may need a little adjusting. If you need a trigger guard the Crosman one is the same as the 440. I had very little trouble fitting Gamo stocks to Crosman so you would be doing the reverse. Don't know if you want to go to that trouble though. These are in addition to the Nitro piston ones Roadworthy mentions above. You could probably fit a Crosman plastic breech plug in the Gamo gun and not have to trim out the Crosman wood stock. I also removed the anti-beartrap stuff and safety because I thought they were too junky. I don't know if they would have required any fitting. My older springers did not have them so I don't miss them and I'm the only one shooting them.