{"product_id":"benelli-m4-extended-magazine-cap-1-or-3","title":"Benelli M4 Extended Magazine Cap +1 or +3","description":"\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eBenelli M4 Extended Magazine Cap – Titanium | +1 or +3 Capacity\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe Benelli M4 ships from the factory limited to 7 rounds in the tube on a standard build — or 5 rounds on an SBS. The Shell Tactical Magazine Cap Extension pushes past that ceiling without replacing your tube, modifying your receiver, or requiring a heat gun. It replaces the OEM magazine cap with a longer titanium cap that extends past the muzzle, adding physical tube length and capacity at the end of your existing setup.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTwo versions are available. The \u003cstrong\u003e+1 cap\u003c\/strong\u003e brings a standard M4 to 8+1 and an SBS to 6+1. The \u003cstrong\u003e+3 cap\u003c\/strong\u003e brings a standard M4 to 10+1 and an SBS to 8+1 — the longest tube-fed capacity available on the Benelli M4 platform without permanent modifications to the receiver or tube.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThis is a Shell Tactical original, precision CNC machined from aircraft-grade titanium alloy and Cerakoted in the USA.\u003c\/p\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eWho this is for:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe Magazine Cap Extension is the right product for two situations. The first is the standard M4 owner who has already maxed out their 7-round tube and wants to push capacity further — competition shooters, home defense builds, or anyone running the gun hard who wants every round available. The second is the SBS owner who needs added capacity within the constraints of a shortened platform, where a full-length 7-round tube isn't an option.\u003c\/p\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003e+1 vs. +3 — which is right for you:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe \u003cstrong\u003e+1 version\u003c\/strong\u003e adds one round of capacity with a modest extension past the muzzle. More compact, less visual profile change, still a meaningful upgrade.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe \u003cstrong\u003e+3 version\u003c\/strong\u003e extends further past the muzzle and adds three rounds of capacity. The longer extension is the right choice for shooters prioritizing maximum capacity over a compact profile — competition use, HD builds, or SBS owners who want to maximize rounds on a shortened platform.\u003c\/p\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eConfiguration\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e+1 Cap\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" scope=\"col\"\u003e+3 Cap\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\"\u003eStandard M4 (7rd tube)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\"\u003e8 rounds\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\"\u003e10 rounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\"\u003eSBS (5rd tube)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\"\u003e6 rounds\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\"\u003e8 rounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eWhy titanium:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePrecision CNC machined from aircraft-grade titanium alloy and Cerakoted in the USA. Titanium is lighter than steel, stronger than aluminum, and virtually rust and corrosion-proof. Adding capacity at the muzzle end naturally shifts balance forward — using titanium rather than steel keeps that weight penalty as low as possible.\u003c\/p\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eMaterial: Aircraft-grade titanium alloy\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eFinish: Cerakoted\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eVersions: +1 (8+1 on standard M4 \/ 6+1 on SBS) and +3 (10+1 on standard M4 \/ 8+1 on SBS)\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eReplaces the OEM magazine cap — no permanent modifications required\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eCompatible with: Original Benelli M4 \/ M1014 with 7-round tube, and SBS configurations with 5-round tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eColors:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eBlack: custom dark gray Cerakote — can be deepened with a light coat of gun oil\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eH2O: custom titanium-colored Cerakote to closely match the Benelli M4 H2O \/ Titanium Cerakote finish\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eFDE: flat dark earth Cerakote to match OEM FDE Benelli M4s\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eRemove the existing magazine cap and thread on the Shell Tactical Magazine Cap Extension. No tools, no heat gun, no gunsmithing required.\u003c\/p\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cb\u003eSprings:\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe +1 tube includes an 8-round spring, and the +3 tube comes with a 10-round spring.\u003c\/p\u003e\n\u003ch2 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eBuilding maximum capacity from scratch?\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe Magazine Cap Extension pairs with the \u003ca href=\"https:\/\/shelltactical.com\/products\/benelli-m4-magazine-tube-7rd\" title=\"Benelli M4 magazine Tube\" rel=\"noopener\" target=\"_blank\"\u003eBenelli M4 7-Round Magazine Tube\u003c\/a\u003e\u003ca href=\"#\" class=\"underline underline underline-offset-2 decoration-1 decoration-current\/40 hover:decoration-current focus:decoration-current\"\u003e\u003c\/a\u003e for a standard M4 build, or the \u003ca href=\"https:\/\/shelltactical.com\/products\/benelli-m4-magazine-tube-5-round\" title=\"Benelli M4 Magazine Tube 5 Round\" rel=\"noopener\" target=\"_blank\"\u003eBenelli M4 5-Round Magazine Tube\u003c\/a\u003e for an SBS build.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cem\u003eNote: No products that increase capacity over 5 rounds ship to NJ or MA.\u003c\/em\u003e\u003c\/p\u003e","brand":"Shell Tactical","offers":[{"title":"+1 Extension \u0026 8rd Spring \/ Black","offer_id":51505909629218,"sku":null,"price":149.99,"currency_code":"USD","in_stock":true},{"title":"+1 Extension \u0026 8rd Spring \/ H2O","offer_id":51505911103778,"sku":null,"price":149.99,"currency_code":"USD","in_stock":true},{"title":"+1 Extension \u0026 8rd Spring \/ FDE","offer_id":51505911136546,"sku":null,"price":149.99,"currency_code":"USD","in_stock":true},{"title":"+3 Extension \u0026 10rd Spring \/ Black","offer_id":51505909661986,"sku":null,"price":159.99,"currency_code":"USD","in_stock":true},{"title":"+3 Extension \u0026 10rd Spring \/ H2O","offer_id":51505911169314,"sku":null,"price":159.99,"currency_code":"USD","in_stock":true},{"title":"+3 Extension \u0026 10rd Spring \/ FDE","offer_id":51505911202082,"sku":null,"price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0682\/3827\/8946\/files\/Benelli_M4_Extended_Magazine_Caps.jpg?v=1780002723","url":"https:\/\/shelltactical.com\/products\/benelli-m4-extended-magazine-cap-1-or-3","provider":"Shell Tactical","version":"1.0","type":"link"}