{"product_id":"tacfire-mar039-castle-nut-black-steel-for-ar-15-buffer-tube","title":"TacFire MAR039 Castle Nut Black Steel for AR-15 Buffer Tube","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eTacFire MAR039 Castle Nut\u003c\/span\u003e\u003c\/strong\u003e is a mil-spec locking nut designed to secure an \u003cstrong\u003eAR-15\u003c\/strong\u003e buffer tube to the lower receiver. Manufactured from durable \u003cstrong\u003esteel\u003c\/strong\u003e with a \u003cstrong\u003eblack\u003c\/strong\u003e finish, this castle nut threads onto the buffer tube and is staked in place to lock the carbine stock assembly firmly and reliably onto the lower.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eCompatible with standard \u003cstrong\u003eAR-15\u003c\/strong\u003e platforms chambered in \u003cstrong\u003e.223 Remington \/ 5.56x45mm NATO\u003c\/strong\u003e, the MAR039 is an essential component for any lower receiver build, repair, or restock. Its mil-spec dimensions and quality steel construction ensure reliable fitment and long service life under hard use, whether you are completing a new build or replacing a stripped or damaged nut during routine maintenance.\u003c\/span\u003e\u003c\/p\u003e","brand":"TacFire","offers":[{"title":"Default Title","offer_id":55006585585986,"sku":"146753","price":3.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_5b27f6bb-7501-479a-b219-6af2db586c63.png?v=1784581306","url":"https:\/\/centerfiresystems.com\/products\/tacfire-mar039-castle-nut-black-steel-for-ar-15-buffer-tube","provider":"Centerfire Systems","version":"1.0","type":"link"}