{"product_id":"magpul-mbus-flip-up-backup-sights-rear-sight-tough-low-profile","title":"Magpul MBUS Flip-Up Backup Sights Rear Sight - Tough, Low-Profile","description":"\u003cp\u003eIn this review the Magpul MBUS Flip-Up Backup Sights rear unit is examined for shooters who need a lightweight, reliable backup sight that pairs with standard iron sights and modern optics. The bottom line: this rear sight is worth considering if durability, low weight and fast deployment matter most, because its impact resistant polymer construction and spring-loaded flip mechanism deliver dependable performance without adding bulk to the rail. The review focuses on real-world fit, function and build quality rather than marketing claims, and highlights the simple installation and consistent erect\/ folded behavior that customers report.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpact resistant polymer:\u003c\/strong\u003e Provides a very light sight that resists operational abuse while reducing added weight to the firearm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring-loaded flip-up:\u003c\/strong\u003e The sight deploys quickly from either side or by pressing the top for fast activation under stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDetent and spring pressure:\u003c\/strong\u003e Keeps the sight locked erect for consistent aim yet allows unobstructed folding if struck or during handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePicatinny clamp compatibility:\u003c\/strong\u003e Clamps to most MIL-STD-1913 Picatinny and STANAG 4694 rails and matches the standard A2 height-over-bore for co-witnessing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective wings:\u003c\/strong\u003e Shield the spring-locking A2 front sight post and add side protection to prolong service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded adjustment tool:\u003c\/strong\u003e Supplies an elevation adjustment tool while remaining compatible with most aftermarket A2 adjustment tools for easy zeroing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Magpul MBUS rear sight suits casual shooters, competition entrants and duty users who want a dependable, low-weight backup to optical setups and a sight that co-witnesses at A2 height. It is especially useful for those who install a compact optic but want a fast, unobtrusive iron option for redundancy.\u003c\/p\u003e\n\u003cp\u003eThose needing metal sights for extreme abrasion resistance or collectors seeking period-correct steel A2 parts may look elsewhere; this rear unit focuses on modern polymer resilience and light weight rather than traditional all-steel construction.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDurable polymer construction keeps weight low while resisting operational abuse and rough handling.\u003c\/li\u003e\n\u003cli\u003eFast, ambidextrous spring-loaded flip-up action for quick deployment from either side or the top.\u003c\/li\u003e\n\u003cli\u003eSecure detent and spring pressure hold the sight erect and allow it to fold unobstructed on impact.\u003c\/li\u003e\n\u003cli\u003eClamps to standard Picatinny\/STANAG rails and provides A2 height-over-bore for easy co-witness with many optics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePolymer construction may not suit users who prefer traditional steel sights for aesthetic or perceived ultimate durability reasons.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eMBUS flip-up rear sight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eImpact resistant polymer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRail compatibility\u003c\/td\u003e\n\u003ctd\u003eMIL-STD-1913 Picatinny \/ STANAG 4694\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight-over-bore\u003c\/td\u003e\n\u003ctd\u003eStandard A2 iron sight height\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeployment\u003c\/td\u003e\n\u003ctd\u003eSpring-loaded flip-up (ambidextrous)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded tools\u003c\/td\u003e\n\u003ctd\u003eElevation adjustment tool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Magpul MBUS rear flip-up sight is a practical, value-oriented backup for shooters who prioritize light weight, fast deployment and reliable locking under recoil. It is a solid choice for rifle owners who run optics but want a low-profile iron backup that mounts to standard Picatinny rails and co-witnesses at A2 height; its durability and fit make it a sensible investment for most users.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this sight fit my Picatinny rail?\u003c\/strong\u003e\u003cbr\u003eYes, it clamps to MIL-STD-1913 Picatinny and STANAG 4694 rails and is designed for broad compatibility.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it match A2 front sight height?\u003c\/strong\u003e\u003cbr\u003eYes, the rear provides the same height-over-bore as standard A2 irons for co-witnessing with A2 front sights.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs an adjustment tool included?\u003c\/strong\u003e\u003cbr\u003eYes, an elevation adjustment tool is included and most aftermarket A2 adjustment tools are also compatible.\u003c\/p\u003e","brand":"Magpul","offers":[{"title":"Default Title","offer_id":48190149263579,"sku":"B004RR0N8Q","price":57.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61O58zntAjL._AC_SL1500.jpg?v=1769524509","url":"https:\/\/gearmusthave.com\/products\/magpul-mbus-flip-up-backup-sights-rear-sight-tough-low-profile","provider":"GearMustHave","version":"1.0","type":"link"}