The Mesa Tactical SureShell Polymer Carrier provides reliable shell storage for Mossberg 500/590 and Maverick 88 shotguns with a 6-shell capacity in 12 gauge.SureShell Polymer Carrier for Mossberg 500/590 and Maverick 886-shell capacity for 12 gauge ammunitionGlass-filled polymer shell holders for durabilityLightweight aluminum back plate with brass threaded insertsInnovative dual rubber friction system for secure shell retentionThis carrier system mounts securely to your shotgun receiver providing quick access to additional ammunition while maintaining reliable shell retention during tactical operations or sporting use.