I don't believe that scope mount set-up is all that bad. I've seen far worse sold on the commercial market. The forward jacking screw and (hopefully) a reasonably tight fitting cross pin would do most of the required locating. However, the single rear screw WOULD require a good installation job.

Is it "military" grade? No. But neither is the scope! (Of course, mounting an A5 on the side of the rear sight protector and receiver AND then putting it in the trenches seems a bit mad at this late date, too.)

If you want to see some really scary mounts, see Brophy's '03 Springfield book. Frankford Arsenal test stuff included. Oy!