both upper & lower segments of the ARM-02A are M1913 standard compatible
the front lower segment is great for any Laser pointing devices weapon mounted flashlights, while the upper rear portion is ideal for everything from small optics, to a high power Rifle Scope.
the ARM-02A also features an integrated mounting space for the MR-12, allowing for seamless and hassle free setup, all whilst keeping the sight picture low & free of obstructions, yet, still tall enough for the Red dot not to be obstructed by the front sight post.
