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Magpul MBUS Sight Front
The Magpul MBUS (Magpul Back-Up Sight) is one of the most popular backup front sights in the world, designed as a reliable aiming solution in case the primary optic fails. Its lightweight polymer construction combined with high durability has made it a benchmark choice for AR15/M16 platforms.
Key features:
- Instant deployment: the spring-loaded mechanism allows quick activation by pressing the top button or side levers (convenient for both right- and left-handed users).
- Impact-resistant polymer: Magpul’s proprietary material ensures low weight (only 34 g) while providing excellent resistance to mechanical stress.
- Protected design: side “wings” shield the front sight post from impacts, while the streamlined shape reduces snagging on gear or vegetation.
- Adjustment: A2-style front sight post is elevation-adjustable. A dedicated adjustment tool is included and compatible with standard A2 tools.
- Low profile: when folded, the sight sits just 13 mm (0.51”) above the rail, allowing use with most optics.
Technical specifications:
- Platform: AR15, M4, M16 and any system with a Picatinny rail
- Weight (with mount): 34 g (1.2 oz)
- Deployed height: standard A2 sight height
- Folded length: 66 mm (2.6”)
- Adjustment increment: ~1.6 MOA (4.8 cm at 100 m) with a 14.5" sight radius
⚠️ Important installation notes:
- Do not mount on a gas block! Due to its polymer construction, the sight must not be installed directly on a metal rail gas block, as high temperatures may damage it. For this purpose, use the steel Magpul MBUS Pro series.
- Mounting plane: the front sight must be installed on the same plane as the rear sight.
- Compatibility: not compatible with MOE handguards (requires a standard Picatinny MIL-STD-1913 or STANAG 4694 rail).