{"product_id":"armaspec-self-retention-castle-nut-ar-15-m4-7075-t6-aluminum-od-green","title":"Armaspec Self-Retention Castle Nut AR-15\/M4 7075-T6 Aluminum OD Green","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eArmaspec Self-Retention Castle Nut\u003c\/span\u003e\u003c\/strong\u003e is a purpose-built \u003cstrong\u003ebuffer tube castle nut\u003c\/strong\u003e designed for the \u003cstrong\u003eAR-15 \/ M4\u003c\/strong\u003e platform. Its self-retention geometry secures the castle nut to the buffer tube during installation, so it stays in place while you torque it down - no special tools, no staking, and no need for a third hand to keep everything aligned.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eMachined from \u003cstrong\u003e7075-T6 aluminum\u003c\/strong\u003e for an excellent strength-to-weight ratio, this castle nut is finished in a hardcoat anodized \u003cstrong\u003eOD Green\u003c\/strong\u003e for corrosion and abrasion resistance in the field. It threads onto a standard AR-15 \/ M4 buffer tube and provides the secure mounting point your rifle's stock depends on.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you're building a new lower, replacing a lost or damaged castle nut, or simply upgrading from a standard unit, the self-retention design keeps the nut secured to the buffer tube throughout the install, making the build noticeably easier.\u003c\/span\u003e\u003c\/p\u003e","brand":"Armaspec","offers":[{"title":"Default Title","offer_id":55076805476674,"sku":"195427","price":23.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_237c92b8-6c8c-4ca9-a10c-4e32945bc414.png?v=1784756906","url":"https:\/\/centerfiresystems.com\/products\/armaspec-self-retention-castle-nut-ar-15-m4-7075-t6-aluminum-od-green","provider":"Centerfire Systems","version":"1.0","type":"link"}