Remington 870/1100/11-87 Barrel and Magazine Tube Micro-Dot and Rail Mount with Red Micro-Dot Optic The Mount and Rails are fully Customizable. The Mount can be configured into a Dozen different configurations to suite the Shooters requirements. Dedicated Cantilevered Micro Dot mount is compatible with NcSTAR Micro-Dot Reflex Optics: DDAB, DDABL, DDABL, DGAB, DXDAB, and DXGAB Includes Rail Adapter for the Micro-Dot Base for mounting Weaver/Picatinny type accessories/optics on top of the Cantilever mount. Includes two side Weaver/Picatinny type rails for attaching Accessories like Flashlight & Lasers to your Shotgun. Fits most Remington 870/1100/11-87 Express/Express Tactical/Special Purpose/ Police models with factory 1" extended capacity magazine tubes.