Mesa Tactical Benelli SuperNova SureShell Aluminum Carrier and Rail 6-Shell 12 Gauge 55 in Black. These shotshell carrier/rail systems mount by using the drilled and tapped holes on top of the shotguns receiver. SureShell Aluminum Shotshell Carriers with Rail are machined from 6061-T6 aluminum and use Mesa Tacticals innovative rubber friction retention system to firmly and reliable hold shells in place until needed. Four/six-shell configurations and multiple rail lengths available. SureShell shotshell carriers are assemblies comprising an aluminum yoke and backing plate and a Santoprene elastomer tube. The yoke features four to six vertical bores .700 or .810 in diameter to accept 12-gauge shotgun shells. The shells are securely retained by the elastomer tube interfering with the bores. In many cases shells can be confidently retained in a brass down as well as a brass up configuration though brass up is most secure. The shell carrier yoke is attached to a machined bracket with an integral Picatinny (MIL-STD 1913) sight rail. The design allows the ShotShell assembly to be installed on the top of the shotgun by taking advantage of the factory tapped Picatinny (MIL-STD 1913) rail holes. Specifications for Mesa Tactical SureShell Aluminum Carrier and Rail: Manufacturer: Mesa Tactical Color: Black Fabric/Material: Aluminum Package Contents: Mesa Tactical SureShell 4 Aluminum Carrier and Rail includes necessary hardware What firearm models does the manufacturer say Mesa Tactical SureShell Aluminum Carrier and Rail is compatible with? The manufacturer suggests that Mesa Tactical SureShell Aluminum Carrier and Rail is compatible with Mossberg Model 930 Remington V3 Mossberg Model 590 Benelli M4 Mossberg Model 500 Benelli SuperNova Benelli M2 Beretta 1301 Competition Beretta 1301 Tactical Kel-Tec KSGMesa Tactical 92010: Benelli SuperNova SureShell Aluminum Carrier and Rail 6-Shell 12 Gauge 55 in Black