{"product_id":"fab-defense-fxfbs-front-back-up-sight-ar-15-m4-m16-flip-up-black-polymer-metal","title":"FAB Defense FXFBS Front Back-Up Sight AR-15\/M4\/M16 Flip-Up Black Polymer \u0026 Metal","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eFAB Defense FXFBS Front Back-Up Sight\u003c\/span\u003e\u003c\/strong\u003e is a low-profile, spring-locked flip-up front sight purpose-built for the \u003cstrong\u003eAR-15\u003c\/strong\u003e, \u003cstrong\u003eM4\u003c\/strong\u003e, and \u003cstrong\u003eM16\u003c\/strong\u003e platform. Designed to serve as either a primary aiming solution or a low-profile auxiliary back-up, the FXFBS deploys with a positive spring action and folds flat to keep your primary optic's sight picture completely unobstructed.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe sight mounts quickly and securely on any standard \u003cstrong\u003e1913 Picatinny rail\u003c\/strong\u003e, making it a drop-in addition to nearly any flattop AR build. Its construction blends a lightweight \u003cstrong\u003epolymer\u003c\/strong\u003e body with \u003cstrong\u003emetal\u003c\/strong\u003e internal components in a non-reflective matte \u003cstrong\u003eblack\u003c\/strong\u003e finish. The low folded profile keeps the sight tucked well below the line of sight when stowed, while the sight tower features an ergonomic shroud to protect against impacts and snags.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eA major advantage of the FXFBS is its tool-free windage adjustment, allowing the shooter to quickly and easily zero the front sight without breaking out extra gear. Pair it with a matching FAB Defense RBS rear flip-up sight for a complete co-witnessed back-up iron sight system, or use it on its own alongside a magnified or red-dot primary optic for a reliable offset or co-witnessed aiming option on defensive, duty, and recreational AR builds.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eFlip-up front back-up sight\u003c\/strong\u003e for AR-15, M4, and M16 platforms\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003eMounts to any standard \u003cstrong\u003e1913 Picatinny rail\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eLow folded profile\u003c\/strong\u003e with spring-locked deployment\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003eLightweight \u003cstrong\u003epolymer and metal\u003c\/strong\u003e construction in matte \u003cstrong\u003eblack\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003eTool-free windage adjustment for fast, precise zeroing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003eErgonomic shroud protects the sight tower from impacts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14pt;\"\u003eFunctions as primary or back-up iron sight\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FAB Defense","offers":[{"title":"Default Title","offer_id":55112766062914,"sku":"107027","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_5992f421-8d7d-47f1-94d0-451affbb133c.png?v=1784806598","url":"https:\/\/centerfiresystems.com\/products\/fab-defense-fxfbs-front-back-up-sight-ar-15-m4-m16-flip-up-black-polymer-metal","provider":"Centerfire Systems","version":"1.0","type":"link"}