Aimpoint Comp M4S mount base
grabcad
It is that small piece, an integrated mount, that is the interface between the mount rail and the sight itself. Copyright of the design belongs to Aimpoint, I just drew it for fun. It is attached to the scope by two hex screws. It also has a couple more pieces attached to be mountable - torque knob, smaller plate that grabs the rail and axle/bolt that keep them all together. On this model I cut the groove to the back, to see how well it attaches to the NATO rail. It is not there on real thing.
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