{"product_id":"mesa-saddlerail-4-mos-6-12ga","title":"Mesa Tactical SaddleRail 4 MOS – Mossberg 500\/590 12 Gauge","description":"\u003cp\u003eThe Mesa Tactical SaddleRail 4 MOS is a Picatinny rail mount designed for Mossberg 500 and 590 series 12-gauge shotguns. This saddle mount replaces the factory receiver cover, providing a stable, repeatable optics platform for red dots, holographic sights, or backup iron sights. The SaddleRail solves the common problem of shotgun receiver flex by securely clamping to both sides of the receiver, maintaining zero even under heavy recoil.\u003c\/p\u003e\u003cp\u003eMachined from 6061-T6 aluminum with a matte black hard-anodized finish, the SaddleRail features four Picatinny slots for mounting flexibility. Installation requires basic hand tools and minor fitting—the rail clamps around the receiver using provided hardware, but proper alignment is critical for reliable function. Some users may need to lightly file the interior fit depending on receiver tolerances. This is not a drop-in part; take your time during installation or consult a gunsmith if unfamiliar with shotgun modifications.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Receiver Rail Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e Mossberg 500\/590 Series 12 Gauge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 6061-T6 Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Matte Black Hard Anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRail Slots:\u003c\/strong\u003e 4-Slot Picatinny\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires Fitting and Proper Alignment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Mounting Hardware\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mesa Tactical","offers":[{"title":"Default Title","offer_id":47938709455103,"sku":"MESA93630","price":118.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1278451.jpg?v=1766526043","url":"https:\/\/doublestackstore.com\/products\/mesa-saddlerail-4-mos-6-12ga","provider":"Double Stack Store","version":"1.0","type":"link"}