Bob, not taking away from Frank's skill on the repair, I have done two that were broken like that. I used the method I described and used a junk recoil plate as the "clamp. That way I knew the plate would fit after the glue had dried. Oh, and I am a BIG believer in wax paper. Even if it sticks, it wont damage wood or metal - just peel it off.
Oh, its been 10 days since you started this thread and you STILL haven't got that carbine shooting yet???? What's up with that?????