While the Benelli M2 Tactical semi-automatic shotgun features factory-tapped rail mounting holes in the top of the receiver, the Benelli M4 and M1014 are shipped with a top Picatinny sight rail. These provided us with an opportunity to develop SureShell shotshell carrier mounting solutions for the Benellis that are streamlined and very robust. Receiver mount SureShell shotshell carriers for these Benellis feature mounting brackets with integral top Picatinny sight rails. These brackets are secured to the weapon using the top mounting screw holes. The SureShell shotshell carriers are thus slung on the left side of the receiver, securely fastened at the top. No other shell carrier mounting method is as secure or looks as good. These SureShell shotshell carriers can be installed on Benelli M1 shotguns by tapping the top of the shotgun receiver with #8-40 threads. Consult a gunsmith.