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When your red dot or scope goes dark at the worst possible moment, a set of back-up irons keeps you in the fight. The Yankee Hill 5040 Q.D.S. is a same-plane folding front and rear sight set built for AR-style rifles, and the standout feature is the Quick Deploy System. One push of a button and the spring-loaded sight snaps into the upright position, ready to aim. Both sights lock positively in the folded and deployed positions, so they won't flop around or creep up under recoil.
Both the front and rear are machined from aircraft-quality aluminum and finished in black hardcoat anodizing to mil-spec, which means these are metal parts, not the flimsy polymer flip-ups you find bundled with budget builds. When folded, each sight sits just .435 inches off the rail, keeping the profile low enough to co-witness or tuck cleanly under a magnified optic. The whole set tips the scales right around 3.4 ounces, so you're not adding meaningful weight to the gun.
The front sight mounts on the same plane as the rear, meaning both attach to a flat-top upper or a quad rail handguard at matching height for a proper sight picture. Windage and elevation both adjust in 1/2 MOA increments, giving you fine control when you're zeroing at the range. The rear offers a dual peep aperture with a large and small opening, so you can flip to the wider hole for fast close-range work or the tighter aperture for precision at distance. Adjusting the front post calls for a standard front sight tool, the same kind you'd use on any A2-style post.
This is the standard stem version of the set, which mounts using standard Picatinny hardware and made in the U.S.A. Folks running these on carbines and utility builds tend to appreciate how solid they feel once broken in, and the automatic deployment makes them genuinely quick to bring up. If you want dependable iron sights that back up your glass without adding bulk, the 5040 is a straightforward, well-built choice.
Both sights use YHM's Quick Deploy System, so a single push of the button lets the spring-loaded sight snap upright on its own. They lock positively in both the folded and deployed positions, which keeps them from bouncing loose under recoil. When folded, each sight sits just .435 inches off the rail for a low profile.
These are same-plane sights that sit at standard height, so on a flat-top AR they'll give you the typical AR-height sight picture that co-witnesses with most red dots. Since they fold down to .435 inches, they tuck neatly beneath your optic when you don't need them. Deployed height comes in right around 1.48 inches.
Yes, the rear on the 5040 Q.D.S. features a dual peep with both a large and small aperture. Flip to the wider opening for fast target acquisition up close, and use the smaller peep for tighter precision at longer range. Windage adjusts in 1/2 MOA clicks for dialing in your zero.
Adjusting the front post on the Yankee Hill 5040 calls for a standard front sight tool, the same style used on any A2-type post. Elevation runs in 1/2 MOA increments so you can fine-tune your zero. The sights mount to a standard Picatinny rail using standard hardware.
| UPC | 816701013283 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 5040 |
| Color | SIGHT SET |
| Length | 14.0500 |
| Product Type | Flip Up Front/Rear |
| Style | Folding Back Up Sight Set |
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