{"product_id":"cmmg-mk4-receiver-extension-castle-nut-for-ar-15-buffer-tube-matte-black-55ca9cb","title":"CMMG MK4 Receiver Extension Castle Nut for AR-15 Buffer Tube, Matte Black 55CA9CB","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CMMG MK4 Receiver Extension Castle Nut is a replacement castle nut designed to secure your receiver extension (buffer tube) for AR-15 platforms. Manufactured for dependable fit and function, it features a durable matte black finish for a clean, corrosion-resistant look that complements most builds. Ideal for maintenance, repairs, or upgrades, this castle nut helps keep your buffer tube assembly properly retained under hard use.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Highlights\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAR-15 castle nut for securing the receiver extension (buffer tube)\u003c\/li\u003e\n  \u003cli\u003eMatte black finish for a low-glare, tactical appearance\u003c\/li\u003e\n  \u003cli\u003eQuality replacement component from CMMG for reliable fit and function\u003c\/li\u003e\n  \u003cli\u003eDurable steel construction for long service life\u003c\/li\u003e\n  \u003cli\u003eGreat for repairs, rebuilds, and AR lower receiver upgrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e CMMG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Receiver extension (buffer tube) castle nut\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlatform Compatibility:\u003c\/strong\u003e AR-15\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel\/Series:\u003c\/strong\u003e MK4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\/Color:\u003c\/strong\u003e Matte Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 lb\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Manufacture:\u003c\/strong\u003e United States of America\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 55CA9CB\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 815835017426\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":44077078773882,"sku":"FLX-175370","price":17.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/283695578.png?v=1767633007","url":"https:\/\/tlooutdoors.com\/products\/cmmg-mk4-receiver-extension-castle-nut-for-ar-15-buffer-tube-matte-black-55ca9cb","provider":"TLO Outdoors","version":"1.0","type":"link"}