NcSTAR Shotgun Barrel/Mag Tube Micro-Dot/Rail Mount Black Mossberg 500/590. These hard anodized aluminum Red Dot Sight Mounts from NcSTAR mount solidly for accurate aiming time after time. The NcSTAR Shotgun Barrel/Mag Tube Tactical Mount features a dedicated spot for the micro dot that is cantilevered for versatility. Experience a custom build when you add the NcSTAR Shotgun Barrel/Mag Tube Micro-Dot/Rail Aluminum Mount. Specifications for NcSTAR Shotgun Barrel/Mag Tube Micro-Dot/ Picatinny-Weaver Rail Mount: Length: 2.7 inches Height: 3 inches Weight: 5.2 oz. Features of NcSTAR Shotgun Barrel/Mag Tube Mount w/ Cantilever Micro-Dot Mount: For mounting optics and accessories to your shotgun. Fully customizable. Mount can be configured to suit the shooter's requirements Includes rail adapter for the micro-dot base for mounting Weaver/Picatinny type accessories/optics on top of the cantilever mount. Includes 2 side Weaver/Picatinny type rails for attaching accessories like flashlights or laser sights. Aluminum construction with black anodized finish. Dedicated Cantilevered Micro Dot mount is compatible with NcSTAR Micro-Dot Reflex Optics: DDAB DDABG DDABL DGAB DXDAB and DXGAB Package Contents: NcSTAR Shotgun Barrel/Mag Tube Picatinny-Weaver Micro-Dot/Rail Mount NcSTAR MSHBDMOS: Shotgun Barrel/Mag Tube Micro-Dot/Rail Mount Black Mossberg 500/590