Side Mounted 12GA Shell Holder With Picatinny Rail. Custom Fit For Mossberg 500/590/Shockwave. Monstrum


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  • Built for use with Mossberg 500, 590, and Shockwave Series shotgun models.
  • Also compatible with Mossberg Shockwave, 535, 835, and 590a1 models.
  • Patent Pending Shell holder accommodates up to six 12 gauge shotgun shells.
  • Patent Pending Ambidextrous design allows for installation on either side of the stock.
  • Rail mount allows for the mounting of Picatinny or Weaver standard scopes, red dots, or other optics.
  • Installs via included set screws into the Mossberg factory mounting holes with no additional gunsmithing required. Note: Will not work if forend/pump action extends past the receiver.
  • Shipped In Eco-Friendly Frustration Free Packaging.
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  • Description:
  • Unit installs into the factory mounting holes of Mossberg 500 or 590 Series shotgun models with no additional gunsmithing required. Also compatible with Mossberg Shockwave, 535, 835, and 590a1 models. Please note that pre-1997 Mossberg shotguns were manufactured with a different mounting hole pattern and will require 6x48TPI screws (not included).