{"product_id":"luth-ar-cs-02-carbine-lock-ring-castle-nut-black-steel-ar-15","title":"Luth-AR CS-02 Carbine Lock Ring\/Castle Nut Black Steel - AR-15","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eLuth-AR CS-02\u003c\/span\u003e\u003c\/strong\u003e is a \u003cstrong\u003ecarbine lock ring \/ castle nut\u003c\/strong\u003e designed to retain the carbine buffer tube to the lower receiver on \u003cstrong\u003eAR-15\u003c\/strong\u003e platform rifles. Machined from durable \u003cstrong\u003e4140 steel\u003c\/strong\u003e with a \u003cstrong\u003emanganese phosphate\u003c\/strong\u003e finish, this threaded steel ring is built to withstand the rigors of regular use and serves as a critical structural component of any carbine build.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe CS-02 works with \u003cstrong\u003ecommercial, military, and M4\u003c\/strong\u003e buffer tube specifications, making it a versatile replacement or upgrade castle nut for a wide range of carbine lowers. The black manganese phosphate coating provides corrosion resistance and a low-glare finish that blends with the rest of your rifle's components.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you're completing a new build, replacing a damaged castle nut, or keeping a spare in your armorer's kit, the Luth-AR CS-02 Carbine Lock Ring \/ Castle Nut is an essential and economical part of your carbine rifle.\u003c\/span\u003e\u003c\/p\u003e","brand":"Luth-AR","offers":[{"title":"Default Title","offer_id":55100571976002,"sku":"186406","price":2.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_c7915150-d9bf-4a34-b4c1-eb8b06a7b437.png?v=1784790523","url":"https:\/\/centerfiresystems.com\/products\/luth-ar-cs-02-carbine-lock-ring-castle-nut-black-steel-ar-15","provider":"Centerfire Systems","version":"1.0","type":"link"}