Magpul Industries

Magpul MBUS 3 Sight Front for AR15/M4

Name: Magpul MBUS 3 Sight Front for AR15/M4
Brand: Magpul Industries
SKU: MAG1166-BLK

£54.99

Tax included where applicable.

In stock7–10 day delivery

Colour: Black

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Delivery Information

Orders are dispatched from the United Kingdom with tracked delivery. You will receive tracking details by email once your order ships.

Returns & Refunds

Please see our Returns & Refunds policy for full details on returns and exchanges.

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SKU: MAG1166-BLKUPC: 840815132165

Product Overview

The third generation of the world's most popular backup sight — stronger, slimmer and smoother than ever.

The 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.

The 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.

Why shooters choose the MBUS 3 Front

Strengthened GEN3 housing — tougher where MBUS sights get hit
Constant-tension deployment — crisp, positive, ambidextrous
Tool-less elevation adjustment — the fastest-zeroing MBUS yet
Slim, snag-resistant profile — folds low and clean
Three finishes — Black, Flat Dark Earth, Olive Drab Green

Fit & installation

Clamps to any 1913 Picatinny top rail at the forward position. Pair with the MBUS 3 Rear (MAG1167) for a matched, ambidextrous backup system.

Specifications

Model: MAG1166
Mount: 1913 Picatinny top rail
Type: Flip-up front backup sight
Material: Reinforced polymer
Finishes: Black, Flat Dark Earth, Olive Drab Green

The proven backup, perfected. Order the MBUS 3 Front today — in stock at Xtreme Tactical Gun Parts with free UK delivery.

Explore more: Iron Sights & Backup Sights, AR-15 Parts or browse all Magpul.

Compatibility & Fitment

Fits 1913 Picatinny top rails on AR15/M4 pattern rifles. Pairs with the MBUS 3 Rear (MAG1167).

Please confirm platform, interface and fitment requirements before ordering.

Technical Specifications

SKU / MPN	MAG1166-BLK
UPC / Barcode	840815132165
Brand	Magpul Industries

Shop Related Categories

Shop AR-15 Parts & Accessories View category

Shop Iron Sights & Backup Sights View category

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Shop Magpul MBUS Sights & Backup Iron Sights View category

Related Buying Guides

Not sure which option is right for your build? These guides break it down.

Buying Guide Magpul MBUS 3 vs MBUS Pro: Which Backup Sights Should You Buy?

Buying Guide Best AR-15 Upgrades Under £100 (That Actually Make a Difference)

View all buying guides →

Product Questions

What does the MBUS 3 front sight mount to?

It fits 1913 Picatinny top rails on AR15/M4 pattern rifles, so you need a continuous or front rail section at the gas block or handguard end. It is designed to pair with the MBUS 3 Rear (MAG1167). Check that your rail height at the front matches the rear sight position you plan to use.

How is elevation set on this sight?

Elevation is tool-less, so you can zero the front post at the range without carrying a sight tool or a cartridge rim. That is the practical difference from older backup sights that need a tool to depress and rotate the post. It stays folded out of the way of an optic until you flip it up.

How does the MBUS 3 differ from the MBUS Pro?

The MBUS 3 is reinforced polymer, which keeps weight down and allows the colour options, while the MBUS Pro line is steel and offered in black only. Both are backup sights for a Picatinny rail, so the choice is mostly about material, weight and finish. Our MBUS 3 vs MBUS Pro guide goes through it in more detail.

Which colour, and do I need the rear sight too?

It is available in Black, Flat Dark Earth and Olive Drab Green. A front sight on its own is only half a sight picture, so you will want a matching rear unless your rifle already has one. Fitting is to the rail clamp screw, so a suitable driver is all that is usually needed.

How is it shipped, and what if it does not co-witness?

Sights are dispatched from the United Kingdom with free tracked UK delivery and tracking comes by email when the parcel leaves. If the height or rail fit is not right for your build, see our returns policy or contact us and we'll help sort it.