Yankee Hill Machine QDS Quick Deploy Flip-Up Rear Sight Dual Aperture AR-15 Flat-Top Aluminum Matte

The Yankee Hill Machine QDS Quick Deploy Flip-Up Rear Sight is a spring-assisted backup sight designed for AR-15 flat-top receivers. Built from aircraft-grade aluminum and finished in matte hardcoat anodize to military spec, this rear sight pairs reliability with speed on target. The automatic deploy mechanism springs the sight into position with a button press, while positive locks hold it securely whether folded or deployed. It's the kind of no-nonsense backup optic that hunters and shooters trust when primary glass fails or when you need a fast, reliable iron sight picture.

What sets the QDS apart is its compact profile. When stowed, the entire sight sits just .435 inches above your rail—low enough to coexist with most modern optics without crowding your receiver or adding bulk to your platform. Deploy it in seconds, lock it down, and you've got a dual-aperture rear sight ready to work. The matte finish resists glare and plays well with tactical aesthetics without sacrificing function.

Whether you run this as primary irons on a budget build or as backup on a multi-optic setup, the YHM QDS delivers the kind of proven design that's earned respect in the shooting community. It's built to handle hard use and spring back without complaint.

Key Features

• Spring-assisted automatic deploy system—push the button and the sight springs up
• Dual aperture rear sight configuration
• Aircraft-grade aluminum construction, hardcoat anodized matte finish
• Positive locking in both folded and deployed positions
• Ultra-compact profile: just .435 inches when folded
• Compatible with AR-15 and compatible flat-top receivers
• Military-spec or better anodize coating for durability

Specifications

Frequently Asked Questions

Will this rear sight work with my AR-15 upper receiver?

Yes—the YHM QDS is designed for AR-15 flat-top receivers. If your upper features a standard Picatinny rail on top, this sight will mount and function as intended.

What does the dual aperture rear sight do?

A dual aperture setup gives you two different sight picture options. You can select the aperture that works best for your distance and lighting conditions without having to change sights.

How does the automatic deploy system work?

Push the button and an internal spring mechanism drives the sight upward into the deployed position. The sight locks positively once raised and stays locked until you manually fold it back down.

Can I use this as a backup sight with a scope or red dot mounted?

Yes. At just .435 inches when folded, the QDS sits low enough on the rail that most modern optics won't interfere with it. This makes it a practical backup iron sight option for primary-optics setups.