Mike, your MS looks like special one. Haven´t ever seen such way to attach rear scope mount and there is something strange in bolts rear end and safety too....

Claw mounts are good but not the usefull ones because if you have to, for reason or another change the type or size of scope, work for it will cost quite much, probably many hundred euros. There in sweden is company which business is assembly rail between claw mounts rear and front under parts. After that you could use normal mounts when attching the scope.