{"product_id":"magpul-mbus-3-sight-front-mag1166","title":"Magpul MBUS 3 Sight Front for AR-15\/M4","description":"\u003cp\u003eThe Magpul MBUS 3 Front is a polymer flip-up backup iron sight for AR-15 and M4 rifles, clamping to any 1913 Picatinny top rail.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe third generation of one of the most widely used backup sights — stronger, slimmer and smoother than ever.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Magpul MBUS 3 Front Sight (MAG1166) refines the polymer backup sight that armed a generation of rifles. The housing is strengthened against crush and impact, the profile is slimmed to reduce snags, and the spring-loaded deployment now runs on crisp constant tension — press the release and the sight snaps up positively, from either side, every time.\u003c\/p\u003e\u003cp\u003eThe detail shooters notice most: the MBUS 3's tool-less front post adjustment, which makes zeroing dramatically quicker than wrestling with a legacy A2-style post tool. Impact-resistant polymer keeps weight and cost down while shrugging off the daily knocks of training — the pragmatic backup for optics-first builds.\u003c\/p\u003e\u003ch3\u003eWhy shooters choose the MBUS 3 Front\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrengthened GEN3 housing\u003c\/strong\u003e — tougher where MBUS sights get hit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstant-tension deployment\u003c\/strong\u003e — crisp, positive, ambidextrous\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool-less elevation adjustment\u003c\/strong\u003e — the fastest-zeroing MBUS yet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlim, snag-resistant profile\u003c\/strong\u003e — folds low and clean\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree finishes\u003c\/strong\u003e — Black, Flat Dark Earth, Olive Drab Green\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat the MBUS 3 Front fits\u003c\/h3\u003e\u003cp\u003eFits 1913 Picatinny top rails on AR-15\/M4 pattern rifles, so you need a continuous or front rail section at the gas block or handguard end. Check that your rail height at the front matches the rear sight position you plan to use. Pair it with the MBUS 3 Rear (MAG1167) for a matched, ambidextrous backup system.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003ctd\u003eAR-15 \/ M4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eFlip-up front backup sight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eReinforced polymer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBlack, Flat Dark Earth, Olive Drab Green\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMount interface\u003c\/th\u003e\n\u003ctd\u003e1913 Picatinny top rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdjustment\u003c\/th\u003e\n\u003ctd\u003eTool-less elevation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eMagpul Industries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMPN\u003c\/th\u003e\n\u003ctd\u003eMAG1166-BLK · MAG1166-FDE · MAG1166-ODG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe proven backup, perfected. \u003cstrong\u003eOrder the MBUS 3 Front today\u003c\/strong\u003e — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eExplore more:\u003c\/strong\u003e \u003ca href=\"\/collections\/iron-sights-backup-sights\"\u003eIron Sights \u0026amp; Backup Sights\u003c\/a\u003e, \u003ca href=\"\/collections\/ar-15-parts-accessories\"\u003eAR-15 Parts\u003c\/a\u003e or browse all \u003ca href=\"\/collections\/magpul-industries\"\u003eMagpul\u003c\/a\u003e.\u003c\/p\u003e","brand":"Magpul Industries","offers":[{"title":"Black","offer_id":60873787572558,"sku":"MAG1166-BLK","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"Flat Dark Earth","offer_id":60873787605326,"sku":"MAG1166-FDE","price":54.99,"currency_code":"GBP","in_stock":true},{"title":"Olive Drab Green","offer_id":60873787638094,"sku":"MAG1166-ODG","price":54.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1081\/3223\/7646\/files\/magpul-mbus-3-sight-front-mag1166-black.jpg?v=1789881035","url":"https:\/\/onyxarmaments.co.uk\/products\/magpul-mbus-3-sight-front-mag1166","provider":"Onyx Armaments","version":"1.0","type":"link"}