Your two options are dump the cash necessary to get it back into working condition, or part it out.
If the ram won't move, even if you cycle it manually outside the gun, then you may be better off parting it, as the ram is a bit expensive to replace (unless you can snag one cheap in somebody else's partout
). Budget at least 50 for the ram. New battery would run you around 50 bucks, or you could snag a Virtue board for $68.50. Any reg can be used on the gun, so you can just try to snag a cheap one. I'd budget at least 30 bucks, even used. Breech seal and button, 10, maybe 15 bucks combined. Add it all up. Patched up in working condition you're probably looking at 200 bucks in resale value. If you don't have much invested in the gun already, personally or financially, it may not be worth the trouble.