{"product_id":"ergo-ar-15-castle-nut-steel-with-black-finish-for-commercial-military-hybrid-buffer-tubes-4971b","title":"Ergo AR-15 Castle Nut, Steel with Black Finish for Commercial\/Military\/Hybrid Buffer Tubes 4971B","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eThe Ergo 4971B castle nut is a durable steel, black-finished castle nut designed for AR-platform builds. Built to help secure the receiver extension (buffer tube) in place, it is compatible with commercial, military, and hybrid buffer tubes and fits AR-15 rifles and other AR variants.\u003c\/p\u003e\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSteel AR-15 castle nut for securing the receiver extension\/buffer tube on AR-platform rifles\u003c\/li\u003e\n  \u003cli\u003eBlack-coated finish for corrosion resistance and a clean, low-glare look\u003c\/li\u003e\n  \u003cli\u003eCompatible with commercial, military, and hybrid buffer tubes\u003c\/li\u003e\n  \u003cli\u003eStandard Mil-Spec CAR-style castle nut design\u003c\/li\u003e\n  \u003cli\u003eFits AR-15 and all AR variants (per manufacturer listing)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand: Ergo\u003c\/li\u003e\n  \u003cli\u003eManufacturer Part Number: 4971B\u003c\/li\u003e\n  \u003cli\u003eUPC: 810049123000\u003c\/li\u003e\n  \u003cli\u003eProduct Type: Castle nut\u003c\/li\u003e\n  \u003cli\u003ePlatform Compatibility: AR-15 \/ AR-platform variants\u003c\/li\u003e\n  \u003cli\u003eBuffer Tube Compatibility: Commercial, Military, Hybrid\u003c\/li\u003e\n  \u003cli\u003eMaterial: Steel\u003c\/li\u003e\n  \u003cli\u003eFinish\/Color: Black\u003c\/li\u003e\n\u003c\/ul\u003e\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 product’s manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"Ergo","offers":[{"title":"Default Title","offer_id":44077222625402,"sku":"FLX-153403","price":18.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/283694883.png?v=1767645687","url":"https:\/\/tlooutdoors.com\/products\/ergo-ar-15-castle-nut-steel-with-black-finish-for-commercial-military-hybrid-buffer-tubes-4971b","provider":"TLO Outdoors","version":"1.0","type":"link"}