{"product_id":"luth-ar-ur-21a-a1-rear-base-sight-assembly-ar-15","title":"Luth-AR UR-21A A1 Rear Base Sight Assembly - AR-15","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eLuth-AR UR-21A\u003c\/span\u003e\u003c\/strong\u003e is an \u003cstrong\u003eA1-style rear base sight assembly\u003c\/strong\u003e purpose-built for \u003cstrong\u003eAR-platform\u003c\/strong\u003e rifles. Designed as a quality, low-cost upgrade or replacement, this rear sight mounts to an A1-pattern AR-15 or AR-10 upper receiver and is a proven choice for retro builds, fixed-sight builds, and rifles in need of a dependable iron-sight back-up.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe UR-21A features an integrated \u003cstrong\u003ewindage adjustment knob\u003c\/strong\u003e, letting shooters dial in their zero without specialty tools. Its clean, low-profile A1-style design keeps the sight tucked close to the handguard while maintaining the classic fixed-rear-sight look favored on traditional AR-pattern rifles. The sight is \u003cstrong\u003emanufactured in the USA\u003c\/strong\u003e and ships complete with the included \u003cstrong\u003eflat spring\u003c\/strong\u003e needed for installation.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eWhether you are finishing a stripped upper, building a classic A1-pattern rifle, or simply replacing a worn or missing rear sight, the \u003cstrong\u003eLuth-AR UR-21A A1 Rear Base Sight Assembly\u003c\/strong\u003e is an easy, dependable, and budget-friendly solution.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Luth-AR\u003cbr\u003e\u003cstrong\u003eMPN:\u003c\/strong\u003e UR-21A\u003c\/span\u003e\u003c\/p\u003e","brand":"Luth-AR","offers":[{"title":"Default Title","offer_id":55102426906946,"sku":"186440","price":23.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_7d04c30d-ea76-46bd-8167-3e7d2db8c8e4.png?v=1784793033","url":"https:\/\/centerfiresystems.com\/products\/luth-ar-ur-21a-a1-rear-base-sight-assembly-ar-15","provider":"Centerfire Systems","version":"1.0","type":"link"}