American Defense Delta Scope Mount 34mm Ring Cap RMR/SRO Footprint Matte Black

From MidwayUSA

The American Defense Delta Ring Cap is an optional accessory that replaces the top ring on your delta scope mount, allowing for the seamless mounting of a red dot, laser aiming module (LAM), range finder, or other accessory at the 12 o'clock position. You can mount a red dot to use as a backup sight, a night vision passive aiming option, or a complement to a high-magnification scope. Mount a LAM or range finder using the 7-Lug Tall Picatinny cap to shift the center of gravity of the firearm rearward, have sighting solutions mounted on a rigid platform, or have all the controls within reach when mounted on the firearm.