Magpul MBUS 3 Sight – Front (MAG1166) — the third-generation polymer flip-up front sight: 0.47 in high folded, 1.38 in wide, 25 g with hardware, spring-loaded ambidextrous deployment, tool-less elevation and a dual-width post. Black or FDE.
$89.95
The Magpul MBUS 3 Sight – Front is the next evolution of the Magpul Back-Up Sight, combining the strengths of the original MBUS and the MBUS Pro in a smaller, lighter polymer unit. Folded it sits just 0.47 in above the rail and 1.38 in wide, and it weighs 0.88 oz (25 g) with hardware. Spring-loaded deployment is triggered by an ambidextrous push-button, the sight rises to standard AR height, and elevation adjusts without tools. The front post is switchable between 0.06 in standard and 0.04 in match widths — about 1 MOA per click on a 14.5 in sight radius (0.7 MOA at 20 in). It mounts to M1913 Picatinny rails on AR15/M4 and AR10/SR25 rifles; Magpul notes it cannot be mounted on railed gas blocks and is not compatible with Magpul hand guards. Made and engineered in the USA. This 3GT listing offers Black and FDE.
Does the MBUS 3 front fit a railed gas block?
No — Magpul states it cannot be mounted on railed gas blocks; fit it to the receiver-height upper rail or a free-float rail.
How is it different from the MBUS Pro front?
The MBUS 3 is polymer and lighter (25 g vs 1.5 oz for the steel MBUS Pro) with a smaller folded footprint; the MBUS Pro is all steel.
Does it pair with the MBUS 3 rear?
Yes — it is designed to pair with the MBUS 3 rear sight, or with any standard-AR-height rear.
Specifications from Magpul (magpul.com).
Firearm parts and accessories are supplied by 3 Gun Tactical, Licensed Firearms Dealer 50001578, Tingalpa QLD. Check your state’s firearm-parts and magazine rules before ordering.
The Magpul MBUS 3 Sight – Front is the next evolution of the Magpul Back-Up Sight, combining the strengths of the original MBUS and the MBUS Pro in a smaller, lighter polymer unit. Folded it sits just 0.47 in above the rail and 1.38 in wide, and it weighs 0.88 oz (25 g) with hardware. Spring-loaded deployment is triggered by an ambidextrous push-button, the sight rises to standard AR height, and elevation adjusts without tools. The front post is switchable between 0.06 in standard and 0.04 in match widths — about 1 MOA per click on a 14.5 in sight radius (0.7 MOA at 20 in). It mounts to M1913 Picatinny rails on AR15/M4 and AR10/SR25 rifles; Magpul notes it cannot be mounted on railed gas blocks and is not compatible with Magpul hand guards. Made and engineered in the USA. This 3GT listing offers Black and FDE.
Does the MBUS 3 front fit a railed gas block?
No — Magpul states it cannot be mounted on railed gas blocks; fit it to the receiver-height upper rail or a free-float rail.
How is it different from the MBUS Pro front?
The MBUS 3 is polymer and lighter (25 g vs 1.5 oz for the steel MBUS Pro) with a smaller folded footprint; the MBUS Pro is all steel.
Does it pair with the MBUS 3 rear?
Yes — it is designed to pair with the MBUS 3 rear sight, or with any standard-AR-height rear.
Specifications from Magpul (magpul.com).
Firearm parts and accessories are supplied by 3 Gun Tactical, Licensed Firearms Dealer 50001578, Tingalpa QLD. Check your state’s firearm-parts and magazine rules before ordering.
| Colour | BLK, FDE |
|---|---|
| Brand | Magpul |
| Model | MBUS 3 Sight – Front |
| Magpul code | MAG1166 |
| Type | Flip-up back-up front sight |
| Height folded | 0.47 in |
| Width | 1.38 in |
| Weight | 0.88 oz / 25 g with hardware |
| Deployed height | Standard AR sight height |
| Elevation adjustment | ~1 MOA per click at 14.5 in sight radius; tool-less |
| Front post | 0.06 in standard / 0.04 in match |
| Mounting | M1913 Picatinny rail (not railed gas blocks) |
| Material | Polymer |
| Country of origin | USA |
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