Mesa Tactical M4 Carbine Stock SureShell Aluminum Carrier 6-Shell 12 Gauge Ambidextrous Black. This Shotgun Shell Carrier by Mesa Tactical will allow you to keep twelve shotshells easily accessible and ready to load at a moment's notice. The Mesa Tactical 12GA SureShell Shotgun Shell Carrier is machined from 6061-T6 aluminum and attaches to any MIL-STD-1913 Picatinny rail. This Mesa Tactical Shell Carrier includes an innovative rubber friction retention system that solidly holds shells in place making this one of the most durable weapon mounted shotgun shell carrier systems on the market. For a great way to carry additional ammunition choose the Mesa Tactical SureShell Tactical Shotgun Shell Carrier. Specifications for Mesa Tactical M4 Carbine Stock SureShell Aluminum Carrier: Manufacturer: Mesa Tactical Color: Black Included Accessories: MIL-STD-1913 Picatinny Rail Gun Model: M4 Number of Rounds: 4 Fabric/Material: Aluminum Cartridge Type: 12 Gauge Shotshells Features of Mesa Tactical SureShell Side Mount Shell Carrier for M4 Carbine Stock: The best and most durable weapon mounted shotshell carrier available. Innovative rubber friction retention system solidly holds shotshells in place. Machined from 6061-T6 aluminum. Hard coat anodized matte black for durable non-glare finish. Available for a wide variety of shotguns. No gunsmithing required. Lifetime Warranty. Package Contents: Mesa Tactical SureShell Side Mount Shell Carrier for M4 Carbine Stock What firearm models does the manufacturer say Mesa Tactical M4 Carbine Stock SureShell Aluminum Carrier is compatible with? The manufacturer suggests that Mesa Tactical M4 Carbine Stock SureShell Aluminum Carrier is compatible with M4Mesa Tactical 93350: M4 Carbine Stock SureShell Aluminum Carrier 6-Shell 12 Gauge Ambidextrous Black