{"product_id":"sig-sauer-mcx-stock-adapter-ar-15-folding-stock-conversion-kit","title":"Sig Sauer MCX Stock Adapter: AR-15 Folding Stock Conversion Kit","description":"\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eSig Sauer MCX Stock Adapter: AR-15 Lower Conversion Kit for MCX Folding Stocks \u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cspan\u003eThe\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSig Sauer MCX Stock Adapter\u003c\/strong\u003e Kit\u003c\/span\u003e\u003cspan\u003e allows you to convert a standard AR-15 lower receiver to accept MCX upper receiver groups and folding stocks. By eliminating the standard buffer tube, this field-proven upgrade reduces your rifle's overall length for covert transport and close-quarters maneuverability. \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eReduces Rifle Profile by Eliminating 1 Receiver Extension:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eThis adapter completely removes the standard AR-15 buffer tube from your lower receiver. Without a buffer tube extending past the receiver, you can attach a side-folding stock to drastically shorten your weapon for transport in discreet bags or confined vehicles.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eMounts 2 Specific Types of Upper Receivers:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eThe adapter configures your mil-spec M4 lower to directly accept both standard Sig Sauer MCX and modern MCX-LT upper receiver groups. This allows you to upgrade your existing lower with a highly reliable piston-driven system without having to buy a completely new rifle.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eSupports 100% of MCX Folding Stock Assemblies:\u003c\/strong\u003e\u003cspan\u003e The built-in vertical rail provides a rock-solid mounting point for any Sig Sauer folding stock. This specific ar15 folding stock adapter is engineered exclusively for side-folding mechanisms and will not work with sliding collapsible stocks or standard pistol braces.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eSig Sauer MCX Stock Adapter System and Accessory Guide\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003ca href=\"https:\/\/www.atomicdefense.com\/products\/sig-folding-stock\" target=\"_blank\" title=\"Sig Folding \u0026amp; Telescoping Stock - 5-Position Adjustable w\/ 1913 Pic Rail\" rel=\"noopener\"\u003e\u003cstrong\u003eSig Sauer MCX\/MPX Telescopic\/Folding Stock\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e\u003cstrong\u003e: \u003c\/strong\u003eThis hybrid polymer-and-aluminum stock attaches directly to the newly installed 1913 Picatinny rail provided by your stock adapter. It completes your MCX conversion with a rugged, dual-action system that folds securely to the side for discreet storage in bags and telescopes to adjust to your perfect length of pull during engagements.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003ca href=\"https:\/\/www.atomicdefense.com\/products\/arisaka-defense-mcx-zero-retention-clamp-fits-sig-sauer-mcx-lt-standard-handguard-anodized-finish-black\" target=\"_blank\" title=\"Arisaka Defense MCX Zero Retention Clamp - Fits Sig Sauer MCX - LT Standard Handguard - Anodized Finish - Black\" rel=\"noopener\"\u003e\u003cstrong\u003eArisaka Defense MCX Zero Retention Clamp (ZRC)\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/www.atomicdefense.com\/products\/arisaka-defense-mcx-zero-retention-clamp-fits-sig-sauer-mcx-lt-standard-handguard-anodized-finish-black\" target=\"_blank\" title=\"Arisaka Defense MCX Zero Retention Clamp - Fits Sig Sauer MCX - LT Standard Handguard - Anodized Finish - Black\" rel=\"noopener\"\u003e:\u003c\/a\u003e \u003c\/strong\u003eWhen running a complete MCX upper receiver on your converted AR-15 lower, preserving your laser and iron Sight alignment is critical. This specialized clamp reinforces the MCX handguard, drastically reducing flex and zero shift during heavy operational use or when bracing the weapon against barricades.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003ca href=\"https:\/\/www.atomicdefense.com\/products\/arisaka-defense-side-scout-mount-mcx-m-lok\" target=\"_blank\" title=\"Arisaka Defense Side Scout Mount MCX M-Lok\" rel=\"noopener\"\u003e\u003cstrong\u003eArisaka Defense Side Scout Mount MCX M-Lok\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e\u003cstrong\u003e: \u003c\/strong\u003eBuilt specifically for the MCX platform, this low-profile mount seamlessly tucks your Surefire or Modlite weapon lights close to the rail. It eliminates side snag hazards and keeps the front profile of your converted rifle as sleek and compact as your rear folding stock.]\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eSig Sauer ROMEO4H Red Dot Sight\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e: \u003c\/strong\u003eThe ideal optical pairing for a fast-handling MCX conversion. Featuring a crisp reticle and robust quick-release mounts, this Sight maximizes the maneuverability of your new folding-stock setup by enabling lightning-fast target acquisition in tight, close-quarters environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eMCX Stock Adapter |  Key Features \u0026amp; Specifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eComplete System Conversion:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eInstantly converts your standard AR-15 or M4 lower receiver to work flawlessly with MCX upper groups.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eBuffer Tube Elimination:\u003c\/strong\u003e\u003cspan\u003e Removes the bulky rear receiver extension, allowing you to use a true side-folding stock to drastically shrink your weapon's footprint.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eSecure Picatinny Mounting:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eFeatures a built-in vertical 1913 Picatinny rail on the rear to firmly lock your new \u003c\/span\u003e\u003cspan\u003eSig stock\u003c\/span\u003e\u003cspan\u003e in place without wobbling.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eCovert Transport Ready:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eBy allowing the stock to fold flat against the receiver, it makes storing your rifle in small vehicles or everyday backpacks incredibly simple.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\n\u003cstrong\u003eDrop-In Installation:\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eDesigned as a direct fit for mil-spec lowers, making it one of the easiest and most effective rifle upgrades for modern shooters.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable data-path-to-node=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,1,0,0\"\u003e\u003cb data-path-to-node=\"1,1,0,0\" data-index-in-node=\"0\"\u003eProduct Type\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,1,1,0\"\u003eLower receiver conversion kit \/ AR15 folding stock adapter\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,2,0,0\"\u003e\u003cb data-path-to-node=\"1,2,0,0\" data-index-in-node=\"0\"\u003eLower Receiver Compatibility\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,2,1,0\"\u003eFits standard Mil-Spec AR-15 and M4 type lower receivers\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,3,0,0\"\u003e\u003cb data-path-to-node=\"1,3,0,0\" data-index-in-node=\"0\"\u003eUpper Receiver Compatibility\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,3,1,0\"\u003eEngineered specifically to accept Sig Sauer MCX and MCX-LT upper receiver groups\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,4,0,0\"\u003e\u003cb data-path-to-node=\"1,4,0,0\" data-index-in-node=\"0\"\u003eStock Compatibility\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,4,1,0\"\u003eDesigned exclusively for MCX folding stock assemblies \u003ci data-path-to-node=\"1,4,1,0\" data-index-in-node=\"54\"\u003e(Note: This adapter will not work with standard sliding AR-15 collapsible stock setups or pistol braces)\u003c\/i\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,5,0,0\"\u003e\u003cb data-path-to-node=\"1,5,0,0\" data-index-in-node=\"0\"\u003eMounting Interface\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,5,1,0\"\u003eRear vertical 1913 Picatinny rail\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,6,0,0\"\u003e\u003cb data-path-to-node=\"1,6,0,0\" data-index-in-node=\"0\"\u003eManufacturer\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"1,6,1,0\"\u003eOriginal factory Sig Sauer production\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 dir=\"ltr\"\u003e\n\u003cspan\u003eSig Sauer MCX Stock Adapter | Box Inclusions\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e(1) Complete Sig Sauer MCX Stock Adapter unit\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e(1) Set of integrated mounting hardware for standard AR-15 or M4 lower receiver.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e (1) Official Sig Sauer operator's manual \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e\n\u003cspan\u003eSig Sauer MCX Stock Adapter | \u003c\/span\u003e\u003cspan\u003eFrequently Asked Questions\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eWhat does this adapter do for my rifle?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe Sig Sauer MCX stock adapter kit is one of the best rifle upgrades you can buy. It lets you change your normal lower receiver so it can use a Sig MCX stock. This means you can easily add a folding stock to your weapon. It is a great choice if you are shopping for top-tier AR-15 and gun accessories.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eCan I still use my old sliding stock?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eNo, you cannot. This \u003c\/span\u003e\u003cspan\u003eAR-15 folding stock adapter\u003c\/span\u003e\u003cspan\u003e removes the long buffer tube at the back of your rifle. Because that tube is gone, a normal \u003c\/span\u003e\u003cspan\u003eAR-15 collapsible or \u003c\/span\u003e\u003cspan\u003eadjustable stock\u003c\/span\u003e\u003cspan\u003e will no longer fit. You must use a true fold-away style stock with this \u003c\/span\u003e\u003cspan\u003eAR folding stock adapter\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\n\u003cspan\u003eHow does the new stock attach to my gun?\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt uses a flat, grooved rail on the back. This lets you slide on a \u003c\/span\u003e\u003cspan\u003ePicatinny folding stock\u003c\/span\u003e\u003cspan\u003e. Once it is locked into place, you can attach your \u003c\/span\u003e\u003cspan\u003eSig stock\u003c\/span\u003e\u003cspan\u003e or \u003c\/span\u003e\u003cspan\u003eMCX stock\u003c\/span\u003e\u003cspan\u003e in seconds. This makes your \u003c\/span\u003e\u003cspan\u003eSig Sauer stock\u003c\/span\u003e\u003cspan\u003e very tight and secure. You will love how easy it is to use a \u003c\/span\u003e\u003cspan\u003efold stock\u003c\/span\u003e\u003cspan\u003e with this system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eWhy should I want a stock that folds?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e Using a \u003c\/span\u003e\u003cspan\u003efolding stock adapter\u003c\/span\u003e\u003cspan\u003e makes your rifle much shorter when you need to put it away. An \u003c\/span\u003e\u003cspan\u003eAR15 folding stock\u003c\/span\u003e\u003cspan\u003e lets you pack your gun into small backpacks or discreet bags. It is perfect for storing in tight spaces. \u003c\/span\u003e\u003cspan\u003eSig Sauer\u003c\/span\u003e\u003cspan\u003e makes this \u003c\/span\u003e\u003cspan\u003etactical gear\u003c\/span\u003e\u003cspan\u003e to help you carry your weapon safely and easily.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\n\u003cspan\u003eWhere can I purchase the Sig Sauer MCX Stock Adapter?\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYou can buy the \u003c\/span\u003e\u003cspan\u003eSig Sauer MCX stock adapter\u003c\/span\u003e\u003cspan\u003e from us at Atomic Defense right now. We sell top-quality gear to help you finish your custom build. Buying directly from Atomic Defense ensures you get trusted, factory-direct parts that are ready to go to work.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Atomic Defense","offers":[{"title":"Default Title","offer_id":55380218642737,"sku":"2401191-R","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0918\/4680\/3761\/files\/sig-sauer-mcx-stock-adapter-tilted-view.webp?v=1784666991","url":"https:\/\/selfrescuetactical.com\/products\/sig-sauer-mcx-stock-adapter-ar-15-folding-stock-conversion-kit","provider":"Self Rescue Tactical ","version":"1.0","type":"link"}