This SureShell Polymer Carrier system, available in a six shell configuration, features shell holders injection molded from glass filled polymer, secured to the receiver by a lightweight aluminum back plate with brass threaded inserts. The SureShell Polymer Carrier also includes an innovative dual rubber friction system that reliably holds shotshells in place. The integrated rail features a Picatinny rail machined from aircraft grade 6061-T6 aluminum, which are mil-spec hard anodized and provide an extremely durable non-glare matte finish. The integrated rail design provides a robust mounting platform suitable for mounting a variety of optical sights and is manufactured in compliance with MIL-STD-1913 Picatinny specifications, and no gunsmithing is required for installation. These rails offer a perfect solution for adding optical sights and SureShell shotshell carriers to Beretta 1301 shotguns equipped with Mesa Tactical's LEO telescoping stock and pistol grip system.