I'm reminded of saddle mounts once offered by Redfield and others used to mount scopes on 870 and 1100 shotguns. The two trigger pin holes through the frame accepted the mount's threaded cross pins, which then could be tightened by turning a nut. Too much torque on the nut flexed the receiver and hindered function.
For me this system never worked. I understand that the APL design differs.
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