First thought is that it looks to be broken clear through, a long way from a crack. If you can get it apart, some threaded steel pins, inserted long ways, so they don't show from the outside and lots of good epoxy. If you want a near invisible, professional job, contact Bob Fulton, in Glenrock, WY. It might cost more than the gun is worth but the repair will be a good one.
http://cap-n-ball.com/fulton/Bob is a friend of mine and does good work. He's not cheap but you'll get what you pay for. Looking at his pictures might give you some ideas.
