{"product_id":"monstrum-side-saddle-shell-holder-with-picatinny-rail-mount-tactical","title":"Monstrum Side Saddle Shell Holder with Picatinny Rail Mount - Tactical","description":"\u003cp\u003eIn this review of the Monstrum Side Saddle Shell Holder with Picatinny Rail Mount, the bottom line is simple: this accessory is for Mossberg owners who want a durable, no-gunsmithing solution to carry extra shells and add optics. It is built specifically for Mossberg 500, 590, and Shockwave Series models and installs using the factory mounting holes with included set screws, so the single biggest reason to buy is the combination of a secure shell saddle and a useful \u003cstrong\u003ePicatinny rail\u003c\/strong\u003e without modifying the shotgun.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel compatibility:\u003c\/strong\u003e Designed for Mossberg 500, 590, and Shockwave Series shotguns so buyers can expect a tailored fit on those receivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShell capacity:\u003c\/strong\u003e Available in two sizes, the 12 gauge saddle holds up to six 12 gauge shells and the 20 gauge saddle holds up to seven 20 gauge shells for ready reloads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRail mounting:\u003c\/strong\u003e The integrated Picatinny\/Weaver rail accepts optics and red dots, adding practical sighting options to a shotgun platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool-free finish install:\u003c\/strong\u003e Installs with included set screws into factory holes, meaning no additional gunsmithing is required for compatible models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Made from a 100% weave material that presents a solid, finished look and durable surface for field use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLegacy fit note:\u003c\/strong\u003e Pre-1997 Mossberg receivers use a different hole pattern and will require 6x48TPI screws (not included), which is important before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis accessory is best for hunters, range shooters, and home defense users who own a compatible Mossberg 500, 590, or Shockwave and want quick access to extra shells plus the ability to mount a compact optic. It suits users who prefer bolt-on accessories that need minimal tools and time to fit.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include owners of Mossberg 500 Bantam, Combo, Flex, or any model where the forend extends past the receiver when pumped, because the unit is not compatible with those variants. Also, buyers of very early pre-1997 Mossbergs should be prepared to source the correct screws separately.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTailored fit and finish for select Mossberg models provides reliable mounting without gunsmithing.\u003c\/li\u003e\n\u003cli\u003eGood shell capacity options for 12 and 20 gauge shooters to carry multiple rounds on the receiver.\u003c\/li\u003e\n\u003cli\u003eIntegrated Picatinny rail adds flexibility for optics or red dots on the shotgun.\u003c\/li\u003e\n\u003cli\u003eCustomers report solid build quality and a clean appearance when installed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report the shell holder can interfere with forend travel on certain setups, which may affect operation.\u003c\/li\u003e\n\u003cli\u003ePre-1997 models require specific 6x48TPI screws that are not included, adding a small extra step for older guns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMonstrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible models\u003c\/td\u003e\n\u003ctd\u003eMossberg 500, 590, Shockwave Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNot compatible with\u003c\/td\u003e\n\u003ctd\u003e500 Bantam, 500 Combo, 500 Flex, models with extended pump travel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShell capacity\u003c\/td\u003e\n\u003ctd\u003e12 gauge: up to 6 shells; 20 gauge: up to 7 shells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eInstalls via included set screws into factory mounting holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRail standard\u003c\/td\u003e\n\u003ctd\u003ePicatinny \/ Weaver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePre-1997 requirement\u003c\/td\u003e\n\u003ctd\u003eRequires 6x48TPI screws (not included) for older receivers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eFor owners of compatible Mossberg 500, 590, and Shockwave shotguns this side saddle with Picatinny rail is a practical upgrade that combines extra shell capacity and an optics platform without permanent modification. It offers strong build quality and useful features at a modest cost, though buyers should confirm model compatibility and consider the pre-1997 screw requirement if applicable.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my Mossberg 500?\u003c\/strong\u003e\u003cbr\u003eIf your model is a Mossberg 500, 590, or Shockwave Series it is designed to fit, but it does not fit Bantam, Combo, Flex, or models where the pump extends past the receiver.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need tools or screws to install?\u003c\/strong\u003e\u003cbr\u003eThe kit installs via included set screws into the factory mounting holes so no gunsmithing is required for compatible models; pre-1997 receivers will need 6x48TPI screws not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I mount an optic on the rail?\u003c\/strong\u003e\u003cbr\u003eYes, the integrated Picatinny\/Weaver rail accepts standard compact scopes, red dots, and similar optics.\u003c\/p\u003e","brand":"Monstrum","offers":[{"title":"Default Title","offer_id":48261224104155,"sku":"B07WHN74TW","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/619vpJD7W5L._AC_SL1500.jpg?v=1778271586","url":"https:\/\/gearmusthave.com\/products\/monstrum-side-saddle-shell-holder-with-picatinny-rail-mount-tactical","provider":"GearMustHave","version":"1.0","type":"link"}