{"product_id":"smith-wesson-m-p9-4-extended-baseplate-carbon-black","title":"S\u0026W - Full size M\u0026P9 2.0 | +4 Extended Baseplate","description":"\u003cp\u003e\u003cspan style=\"font-size: x-large;\"\u003e+4 Magazine Extension Base Plate \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eUpgrade your reloads and grip with a durable \u003cstrong\u003e+4 magazine extension\u003c\/strong\u003e designed to take a 17-round 9mm M\u0026amp;P magazine to \u003cstrong\u003e21\u003c\/strong\u003e rounds while \u003cstrong\u003ereusing the factory spring.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis extension was designed around the full-size M\u0026amp;P platform to provide a secure fit, added capacity, and improved handling without unnecessary bulk.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible with 9mm M\u0026amp;P magazines only.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy You’ll Want This\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eAdds four additional rounds without changing springs\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eProvides a more positive grip and seating surface\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eBuilt for strength, reliability, and repeated use\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eClean, low-profile design that doesn’t feel oversized or awkward\u003c\/p\u003e\n\u003cp\u003eWhether you’re setting up range mags, training mags, or duty-style spares, this extension adds capacity and confidence without compromise.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Details\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe extension includes the extension body, internal spring guide, and locking tab, replacing the factory base plate entirely.\u003c\/p\u003e\n\u003cp\u003eA 2.5 mm hex access hole is built into the design, allowing the locking tab to be tapped out if needed using either a 2.5 mm hex key or a small punch. This allows for clean, non-destructive disassembly if required.\u003c\/p\u003e\n\u003cp\u003eNo extra hardware is required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMade from PET-CF (carbon fiber reinforced PET) for excellent rigidity, dimensional stability, and heat resistance compared to standard plastics. This material was chosen specifically for functional performance, not appearance.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFit \u0026amp; Compatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eDesigned around full-size 9mm M\u0026amp;P magazines\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eWorks with compact models, though the extension will not sit flush with the grip\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eMagwell compatibility is untested and not guaranteed\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eReuses the factory magazine spring\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eInstalls directly in place of the original base plate\u003c\/p\u003e\n\u003cp\u003eAlways verify smooth spring movement after installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e+4 capacity increase (17 → 21)\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e9mm M\u0026amp;P compatibility\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eDesigned around full-size M\u0026amp;P\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eWorks with compact mags (non-flush fit)\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eDurable PET-CF construction\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eNo extra hardware required\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e2.5 mm hex access for disassembly\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotes \/ Disclaimer\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eMagazine and spring not included\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eMagwell compatibility is not guaranteed\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e•\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eThis is an aftermarket accessory, not an OEM product\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e*Designed to fit OEM Smith \u0026amp; Wesson magazines ONLY* \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003ci\u003e\u003cspan\u003eNot for sale or shipment to states with magazine capacity \u003c\/span\u003e\u003cspan style=\"font-family: Helvetica;\"\u003e\u003cspan\u003erestrictions.\u003c\/span\u003e\u003c\/span\u003e\u003c\/i\u003e\u003c\/u\u003e\u003c\/p\u003e","brand":"Jelly Bird Manufacturing","offers":[{"title":"Default Title","offer_id":47932667756803,"sku":"MP20-ME-17","price":13.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0814\/3126\/5539\/files\/foryourpurchase-12_69db42ad-be7e-4672-bd76-aae86bd0cb9b.jpg?v=1775924216","url":"https:\/\/jellybirdmfg.com\/products\/smith-wesson-m-p9-4-extended-baseplate-carbon-black","provider":"Jelly Bird Manufacturing","version":"1.0","type":"link"}