Mesa Tactical SureShell, 6-Shell Side Saddle with Rail, Fits Betretta 1301/A300 Ultima 12 Gauge, Aluminum, Matte Finish, Black 94270 These SureShell shotshell carriers for the Beretta 1301 feature mounting brackets with integral top Picatinny sight rails. Using the top mounting screw holes found on the Beretta 1301 shotguns. 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.