While I also am not Phil, it is a Picatinny rail. Mount a light where you punch the end of the light to turn it on, and you have the slickest and quickest rig imaginable. Install the rail carefully and you can merely shoot to the center of the light spot at "fight stopping" ranges. When I took my .416 Rem setup to Zim, the leopard guides thought it was a grand idea.

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