Mesa Tactical SureShell, 6-Shell Side Saddle with Trijicon RMR Mount, Fits Beretta 1301 Tactical 12 Gauge, Polymer, Matte Finish, Black 95310 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 Mesa's 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.