{"product_id":"nordic-4-mxt-kit-12ga-bk-needs-nut","title":"Nordic Components +4 MXT Extension Kit – 12 Gauge Mossberg 500\/590 Series","description":"\u003cp\u003eThe Nordic Components +4 MXT Extension Kit adds four rounds of 12-gauge capacity to Mossberg 500 and 590 series shotguns. This kit extends your magazine tube without replacing the entire assembly, maintaining your factory tube while providing quick-access extra capacity for home defense, competition, or tactical applications. The MXT system is designed to work with factory magazine springs and followers.\u003c\/p\u003e\u003cp\u003eMachined from aluminum with a durable black finish, the extension integrates cleanly with Mossberg aesthetics. Installation requires removal of the barrel and magazine cap to slide the extension over the existing tube. A magazine tube nut is required to secure the extension (sold separately, not included in this kit). The extension includes a barrel clamp to stabilize the assembly and prevent binding during cycling.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Magazine Extension Kit\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\u003eCapacity:\u003c\/strong\u003e +4 rounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-in with basic tools (magazine tube nut required, not included)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Extension tube, barrel clamp, spring, installation hardware\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Nordic Components","offers":[{"title":"Default Title","offer_id":47938522972415,"sku":"NCMXT-TBS-12-4K","price":73.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/1282574.jpg?v=1766518284","url":"https:\/\/doublestackstore.com\/products\/nordic-4-mxt-kit-12ga-bk-needs-nut","provider":"Double Stack Store","version":"1.0","type":"link"}