The Magpul MBUS Pro Front Folding Sight is an all-steel backup iron sight for AR-15 and M4 rifles, clamping to any 1913 Picatinny top rail.
The Magpul MBUS Pro Front Folding Sight (MAG275) is machined from steel, finished in corrosion-resistant black, and built around one uncompromising requirement: when it flips up, it must be exactly where you zeroed it. The lockup is free of play, the detents are positive, and the post presents a crisp sight picture that steel alone can keep true through years of knocks.
Folded, the MBUS Pro sits astonishingly low on the rail — among the slimmest steel sights made — so it disappears under magnified optics and co-witnesses correctly with red dots. Deployment is instant from either side. For service rifles and serious builds, this is the difference between carrying backup sights and trusting them.
Key Features
- All-steel construction: durability polymer cannot match
- Very low folded profile: stays out of the way under optics
- Locks up with zero play: true return to zero, every deployment
- Co-witnesses with red dots: correct height across standard setups
- Ambidextrous deployment: instant from either side
Compatibility & Fitment
Fits 1913 Picatinny top rails on AR-15/M4 pattern rifles, mounted at the front of the rail with a single fastener. Make sure the front rail sits on the same plane as your rear sight position, and check clearance against your optic's height and objective. Pair it with any MBUS Pro rear, zero the set, and it will hold.
Technical Specifications
Platform | AR-15 / M4 |
Type | Folding front backup sight |
Material | Steel |
Finish | Black |
Mount Interface | 1913 Picatinny top rail |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
What rail does the MBUS Pro front sight need?
It fits 1913 Picatinny top rails on AR-15/M4 pattern rifles, mounted at the front of the rail in the usual front sight position. It pairs with any MBUS Pro rear sight, such as the MBUS Pro Rear (MAG276). Make sure the front rail sits on the same plane as your rear sight position.
What is the advantage of the steel MBUS Pro over a polymer sight?
The MAG275 is all steel, which gives a sight that shrugs off knocks and keeps a slim folded profile under an optic. Polymer flip-ups such as the original MBUS front are lighter and come in colors, but steel is the harder-wearing option. It is a folding design, so it drops flat out of the way until you need it.
How low does it sit when folded?
It folds flat against the rail, which is the point of a backup sight: it should not intrude on the view through your optic. Whether it clears your particular optic depends on that optic's height and objective, so check clearance before committing to a position. Elevation is set on the front post in the normal way when you zero.
Do I need the rear sight as well, and is there a color choice?
A front sight is only useful with a matching rear, so budget for the pair unless you already run an MBUS Pro rear. The MBUS Pro line is black steel with no color options.
