The Mesa Tactical SureShell Polymer Carrier & Rail system provides enhanced ammunition capacity and optics mounting capability for Benelli M4 shotguns. This innovative system combines a 6-shell polymer carrier with a precision-machined 5.5" Picatinny rail for versatile tactical applications.Mesa Tactical SureShell Polymer Carrier & Rail SystemDesigned specifically for Benelli M4 12-gauge shotguns6-round polymer shell carrier with glass-filled polymer construction5.5" Picatinny rail machined from aircraft grade 6061-T6 aluminumDual rubber friction system for secure shell retentionLightweight aluminum back plate with brass threaded insertsMil-spec hard anodized finish with non-glare matte surfaceMIL-STD-1913 Picatinny specification complianceNo gunsmithing required for installationPerfect for tactical applications competitive shooting or home defense this system provides quick access to additional ammunition while offering a robust mounting platform for optical sights and accessories.