Home Forums Hunting & Shooting Handguns Please Help me ID this revolver

So my grandpa handed down a few of his toys today. But there is one revolver that I can't ID. It had a custom barrel and had the cylinder does not lock up. It just spins freely. Don't know if its worth putting money into to fix, or if its just one to throw into the safe. He said it worked before but doesn't know what happened. It has not names or engravings just a serial number.