Mossberg 20-Gauge Shell Carrier with Picatinny Rail Mount - 500/590/Shockwave

Built for use with Mossberg 500 and 590 Series , the shell holder accommodates up to six 12 gauge or seven 20 gauge shells. Also compatible with Mossberg Shockwave, 535 and 835 models.

Not compatible with Mossberg 500 Bantam, Mossberg 500 Combo, Mossberg 500 Flex Models or models where the pump action extends past the receiver when pumped. See attached infographic before purchasing.

Pre-1997 Mossberg were manufactured with a different mounting hole pattern and will require 6x48TPI screws (not included).

Available in two different sizes - one for 12 gauge shells and one for 20 gauge shells.

The shell holder pairs with a 13 slot Picatinny rail mount that secures to the top of your . The two piece design is built to be mounted together as a single unit. Shell holder or rail mount will not install as stand alone units using the included mounting hardware. Unit installs into the factory mounting holes of Mossberg 500 or 590 Series models with no additional gunsmithing required.

Rail mount is machined from 6061 grade aluminum. Shell holder is crafted from lightweight polymer. All Monstrum mount and accessory products are backed by a lifetime warranty.