The line of SureShell shotshell carriers with integrated Trijicon RMR reflex sight mounts for the Benelli M2/M4 and Beretta 1301 shotguns, are similar to Mesas SureShell carriers with integrated optics rail for those platforms, instead of a Picatinny rail these carriers feature a precision machined mount for an RMR reflex sight (NOT INCLUDED). When installed on the shotgun, the RMR sight co-witnesses with factory ghost ring sights.
Features :

Six-shell Polymer configuration
Fits Benelli M4
Includes an Integrated Trijicon RMR Reflex Sight Mount that Co-Witnesses with Factory Ghost Ring Sights
Injection Molded-Glass Filled Nylon Yoke
Type 3 Hard Coat Anodized for Flat Black Durable Finish on Aluminum Parts
Mounts via Drilled and Tapped Receiver Holes
RMR Sight is NOT Included