Mesa Tactical SureShell Polymer Carrier and Saddle Rail Remington Model 870 6-Shell 12 Gauge 20 in Black. These rails are manufactured in compliance with MIL-STD-1913 Picatinny specifications and no gunsmithing is required for installation. The saddle rails offer a perfect solution for adding optical sights and SureShell shotshell carriers to Remington shotguns. Specifications for Mesa Tactical SureShell Polymer Carrier and Saddle Rail: Manufacturer: Mesa Tactical Color: Black Gun Model: Remington Model 870 Gun Make: Remington Gauge: 12 Fabric/Material: Polymer Condition: New Features of Mesa Tactical SureShell Polymer Carrier and Saddle Rail The best and most durable weapon mounted shotshell carrier available Integrated Picatinny rail for optics or sights Innovative rubber friction retention system solidly holds shotshells in place Aluminum yokes are machined from 6061-T6 aluminum; six-shell configurations Polymer yokes are lightweight injection-molded glass-filled nylon and feature two elastomer shell retention tubes Picatinny rails are machined from 6061-T6 aircraft quality aluminum and finished with Mil-spec Type III hard anodizing Mounts via trigger pin holes No gunsmithing is required Lifetime warranty Package Contents: Mesa Tactical SureShell Polymer Carrier and Saddle Rail Hardware Instructions What firearm models does the manufacturer say Mesa Tactical SureShell Polymer Carrier and Saddle Rail is compatible with? The manufacturer suggests that Mesa Tactical SureShell Polymer Carrier and Saddle Rail is compatible with Remington Model 870Mesa Tactical 94800: SureShell Polymer Carrier and Saddle Rail Remington Model 870 6-Shell 12 Gauge 20 in Black