Ultradyne C4 Flip-Up Front and Rear Sight Set for AR-15 - Precision Aluminum Black

The Ultradyne C4 flip-up front and rear sight set for AR-15 rifles brings mechanical backup sighting to a platform that often runs optics-only—and does it without the weight or bulk that bog down a modern carbine. Built from 4140 chrome moly steel with a salt bath nitride finish on the steel components and anodized aluminum on the rear sight, these sights are engineered to stay put under the recoil and abuse a working rifle takes. At just 2.2 ounces for the front and 2.5 ounces for the rear when folded, they're the kind of backup you won't feel in your pack or notice on your shoulder.

What sets the C4 apart is Ultradyne's Dynalign Technology—a mechanical system that ensures all sight elements move together, keeping your sight picture concentric whether you're dialing windage in the field or deploying after a scope failure. The rear sight gives you full windage adjustment and guarantees center-zero operation. Both front and rear sights mount to any MIL-STD 1913 Picatinny rail, so integration with your upper receiver or handguard is straightforward, and they collapse flat when not in use.

The combo includes a 12 MOA Dynalign aperture for the rear sight, with 8, 10, and 14 MOA options available separately if your shooting distance or barrel length demands a different hold. Whether you're zeroing a new build, upgrading a duty rifle, or just want peace of mind when your primary optic goes dark, the C4 delivers the kind of no-nonsense backup sighting that works when it matters.

Key Features

• Dynalign Technology maintains concentric sight picture during field adjustments
• 4140 chrome moly steel construction with salt bath nitride finish for durability
• Anodized aluminum rear sight for lightweight performance
• Compact when stowed: rear 1.38" wide × 0.369" tall; front 1.21" wide × 0.369" tall
• Full windage adjustment range with guaranteed center-zero operation
• Mounts to any MIL-STD 1913 Picatinny rail
• Interchangeable aperture system (12 MOA included; 8, 10, 14 MOA available)
• Easy field adjustment—no tools required for sight deployment

Specifications

Frequently Asked Questions

Will the Ultradyne C4 sights work with my AR-15?

Yes, the C4 front and rear sight set mounts to any MIL-STD 1913 Picatinny rail, which is the standard on most AR-15 uppers and handguards. No special adapters needed.

Can I switch out the rear aperture?

Yes. The set includes a 12 MOA Dynalign aperture, and 8, 10, and 14 MOA apertures are available separately if you need to adjust for different shooting distances or barrel lengths.

How much do these sights add to my rifle?

The front sight weighs 2.2 ounces and the rear weighs 2.5 ounces, for a total of 4.7 ounces—minimal weight penalty for reliable backup sighting.

What makes the Dynalign Technology different?

Dynalign ensures that all sight elements move together during field adjustments, maintaining a concentric sight picture and guaranteeing center-zero operation as you dial windage.