Xs Sight Systems Ar-15 Adjustable Csat Combat Rear Sight Black

The XS Sights AR-15 adjustable CSAT combat rear sight is a battle-tested alternative to the standard A2 aperture that gives you genuine versatility without fumbling or adjustment headaches. Designed by Paul Howe—a retired Army assault team leader, sniper, and respected combat shooting instructor—this dual-function rear sight lets you transition seamlessly between close-quarters engagements and precision shots out to 300 yards, all without changing apertures or repositioning your head.

The CSAT's dual-aperture design is the key. The .095" wide notch at the top works like a pistol sight for fast, intuitive target acquisition at close range—aim the front sight through the notch and shoot. When you need precision, drop down to the .070" diameter peep hole for longer-distance work. Flip the CSAT face down and you've got a standard .200" A2-style peep for close-range-only operations. No moving parts to fail, no complex procedures—just intelligent engineering that matches how shooters actually work.

Built from precision steel with a serrated rear face to kill glare and a dished peep area that helps your eye find the front sight fast, the CSAT adjusts for windage and elevation exactly like a conventional A2 rear sight. Zeroing is straightforward: align the notch at 7 yards, dial in the aperture at 100 yards, then run test fire at 5-yard intervals to find your transition range. Training new shooters becomes simpler too—no exotic technique required, just point, aim, and fire.

If you're running an AR-15 for duty, sport, or serious hunting and want a rear sight that handles the full spectrum of distances without complexity, the CSAT brings proven combat experience to your platform.

Key Features

• Dual-aperture design: .095" wide notch for close-range point-of-aim and .070" peep for precision distance work
• Flip-down standard .200" A2-style aperture for close-range dedicated use
• Engages targets from close quarters to 300 yards without aperture changes
• Windage and elevation adjustment compatible with standard A2 mechanics
• Serrated rear face reduces glare and reflections
• Dished peep design aids rapid front-sight acquisition
• Precision steel construction for durability and reliability
• Designed and validated by Paul Howe, retired U.S. Army SFOD-D team leader and sniper

Specifications

Frequently Asked Questions

Will the CSAT fit my AR-15?

Yes. The XS Sights AR-15 adjustable CSAT combat rear sight is designed as a replacement for the standard A2 rear aperture and adjusts for windage and elevation using the same mechanics, so it installs on any AR-15 with a standard receiver and Picatinny rail.

What apertures does it have?

The CSAT features three aperture options: a .095" wide notch at the top for close-range combat shooting, a .070" diameter peep hole for precision long-range engagement, and a standard .200" A2-style peep hole that flips down for dedicated close-range work. You choose which one suits your distance and shooting style without tools or adjustments.

How do I zero the CSAT?

Start by aligning the notch with your front sight at 7 yards and firing to confirm point-of-impact zero. Move back to 100 yards and zero the aperture using windage and elevation adjustment. Then fire test shots through the notch at 5-yard intervals starting at 10 yards to identify where accuracy degrades—that's your transition point to the peep hole for longer distances.

Who designed this sight and why?

The CSAT was developed by Paul Howe, a retired U.S. Army assault team leader, sniper, and senior combat shooting instructor. It was built to eliminate the decision-making and head repositioning required by traditional single-aperture sights, making it faster and more intuitive for both defensive and precision shooting applications.