{"product_id":"armaspec-self-retention-castle-nut-ar-15-m4-black-anodized-aluminum","title":"Armaspec Self-Retention Castle Nut AR-15\/M4 - Black Anodized Aluminum","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 upgrade for \u003cstrong\u003eAR-15\u003c\/strong\u003e and \u003cstrong\u003eM4\u003c\/strong\u003e buffer tube assemblies. Machined from \u003cstrong\u003ealuminum\u003c\/strong\u003e and finished in a hard \u003cstrong\u003eblack anodized\u003c\/strong\u003e coating, this castle nut features Armaspec's self-retention design that locks in place without the need for staking, giving a secure and rattle-free fit on any standard Mil-spec buffer tube.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eUnlike a factory castle nut that must be staked or carefully torqued to keep it from backing off under recoil, the \u003cstrong\u003eself-retention\u003c\/strong\u003e geometry grips the buffer tube threads and holds itself firmly in position. Installation is straightforward and tool-friendly, making it an easy drop-in upgrade for builders and shooters who want a low-maintenance, no-hassle stock retention solution.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you are assembling a new build, replacing a worn factory nut, or simply want a cleaner and quieter buffer tube setup, the Armaspec Self-Retention Castle Nut delivers the durability and corrosion resistance expected from a quality \u003cstrong\u003eAR platform\u003c\/strong\u003e component.\u003c\/span\u003e\u003c\/p\u003e","brand":"Armaspec","offers":[{"title":"Default Title","offer_id":55470910996802,"sku":"195425","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_d5cc99d7-a239-46b0-9e89-5cd92b91a511.png?v=1785420510","url":"https:\/\/centerfiresystems.com\/products\/armaspec-self-retention-castle-nut-ar-15-m4-black-anodized-aluminum","provider":"Centerfire Systems","version":"1.0","type":"link"}