{"product_id":"fab-defense-fxrbs-rear-back-up-sight-ar-15-m16-m4-dual-aperture-black-polymer-metal","title":"FAB Defense FXRBS Rear Back-Up Sight AR-15\/M16\/M4 Dual Aperture Black Polymer\/Metal","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eFAB Defense FXRBS Rear Back-Up Sight\u003c\/span\u003e\u003c\/strong\u003e is an advanced, low-profile auxiliary rear sight built for \u003cstrong\u003eAR-15\u003c\/strong\u003e, \u003cstrong\u003eM4\u003c\/strong\u003e, and \u003cstrong\u003eM16\u003c\/strong\u003e platforms. Designed as a dependable backup to primary optics, this flip-up sight mounts to any \u003cstrong\u003e1913 Picatinny rail\u003c\/strong\u003e and deploys via a \u003cstrong\u003espring-locked mechanism\u003c\/strong\u003e for quick, confident activation.\u003c\/span\u003e\u003c\/p\u003e\\n\\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eFeaturing a \u003cstrong\u003edual aperture\u003c\/strong\u003e configuration, the RBS provides two aperture options for varying engagement distances. \u003cstrong\u003eWindage adjustment\u003c\/strong\u003e is easy and quick, performed without tools for fast zeroing on the range. The sight folds down to a low, snag-free profile and locks securely in place.\u003c\/span\u003e\u003c\/p\u003e\\n\\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eConstructed from a durable combination of \u003cstrong\u003epolymer\u003c\/strong\u003e and \u003cstrong\u003emetal\u003c\/strong\u003e components in a \u003cstrong\u003eblack\u003c\/strong\u003e finish, the FXRBS keeps weight to a minimum while standing up to hard use. It is an ideal auxiliary sighting solution for rifle builds, carbines, and duty setups where a reliable iron-sight backup is essential.\u003c\/span\u003e\u003c\/p\u003e","brand":"FAB Defense","offers":[{"title":"Default Title","offer_id":55108531945794,"sku":"107066","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_cdd19a4a-4af2-418c-8983-de2bddbc6fcf.png?v=1784802022","url":"https:\/\/centerfiresystems.com\/products\/fab-defense-fxrbs-rear-back-up-sight-ar-15-m16-m4-dual-aperture-black-polymer-metal","provider":"Centerfire Systems","version":"1.0","type":"link"}