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Questions & Answers
how durable are these sights Manufacturer Answer

Very durable! They are made of 416 Stainless Steel and 6061 T-6 Aluminum, strategically planned to optimize strength and weight.

by Ultradyne USA, Manufacturer, October 8, 2025
Can you use the C4 front barrel sight (with Apollo muzzle brake) set at 45 deg and the C4 offset rear sight? Or do they come in matched sets? Manufacturer Answer

It is possible to run this configuration.

by Ultradyne USA, Manufacturer, October 8, 2025
Customer Reviews
Helpful Positive Review
Great back-up sights and weighing in at only 3 oz. for the set. The only down side is the price. Everyday there are new and better knockoffs for under $50. If they are back-ups then they don't need to be that great.
2/6 found this helpful
Helpful Positive Review
Quality is unparalleled, positive snap open and closed, ingenious mounting system and very low profile,simple zeroing and adjustments, sight picture is not a gimmic I'd not go back to a standard blade post now. Are the expensive yes but you get what ...
Read More...
1/1 found this helpful
Helpful Positive Review
GREAT Offset Flip-Up Sights by Art, Verified Owner, August 16, 2021
I have many off-set sights on AR platforms; but these are Number 1 on my list. Can hit targets well beyond 150 yards consistently with excellent front sight (circle) alignment within rear sight (circle) alignment. For long range shooting, these sig...
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5/5 found this helpful
Most Recent Reviews
Best BUIS Sold by Harlee, Verified Owner, April 8, 2025
Solid and feature rich these were selected for my Faxon Ion Ultralight AR-15. They finished my set up and work superbly. I did a ton of research on various sites before deciding on these. I’d buy them again and again from Optics Planet.
Read All 4 Reviews
10% Bonus Bucks
Get even more OpticsPlanet Bucks with the purchase of select models to use on future purchases! You will find the amount you'll earn near eligible models.
Color:
Black
Sight Position:
Front and Rear
Gun Make:
AR Platform
Front Sight Color:
Black
Rear Sight Color:
Black
Front Post Shape:
Aperture
Illumination Color:
None
Included Accessories:
None

Code: 3HE-OIR-OFFF-UD10880

MPN: UD10880

UPC: 851019008484

10% Bonus Bucks
List: $299.00Save $15.01
$283.99

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Ultradyne C4 Offset Flip-Up Front/Rear Sight Set

If you're looking for superior dual-aperture AR 15 Parts, you need to check out the Ultradyne C4 Offset Flip-Up Front/Rear Sight Set. Made from durable 4540 CrMo Steel and 7075 Aluminum, you can count on these iron sights withstanding everything you throw at them! Featuring independent windage adjustment on the front sight, this ensures your rear sight remains perfectly centered at zero. If you're looking for a little more customization, it even has interchangeable 0.070 Aperture and Ghost rings. Pick up a set today!image

Specifications for Ultradyne C4 Offset Flip-Up Front/Rear Sight Set:

Manufacturer: Ultradyne
Color: Black
Sight Position: Front and Rear
Deployable: Yes
Fabric/Material: 4140 CrMo Steel, 7075 Aluminum
Gun Make: AR Platform
Front Sight Color: Black
Rear Sight Color: Black
Front Post Shape: Aperture
Illumination Color: None
Hand: Right
Sight Mounting Orientation: Offset
Included Accessories: None
Country of Origin: USA
Condition: New

Features of Ultradyne C4 OFFSET FOLDING FRONT AND REAR SIGHT COMBO:

  • Purely concentric outer and inner circles on both front and rear sights for target acquisition
  • Windage-Adjustable for zeroing the front sight, which guarantees that the rear sight windage is perfectly centered when at zero for maximum in windage adjustment in either direction along with easy return to zero
  • Tool-less elevation adjustment that is always perfectly concentric with the outer circle
  • Dual aperture sighting system allows the shooter to focus 100% on the target
  • Rear Sight elevation adjustments that match the ballistic path of standard M193 ammunition
  • Rear sight elevations adjustments in 50 Yard increments out to 600 Yards
  • Interchangeable .070 Aperture and Ghost Ring
  • Spare aperture conveniently stores into windage knob
  • Strategic use of materials to maximize stregnth and weight
  • 416 SS with Nitride Finish / CNC Machined 7075 Aluminum

Package Contents:

  • Ultradyne C4 Offset Flip-Up Front/Rear Sight Set

Ultradyne C4 Offset Flip-Up Front/Rear Sight Set Orderable Models

List of Orderable Models

  • Ultradyne C4 Offset Flip-Up Front/Rear Sight Set, Right Hand, Black, UD10880 , MPN: UD10880 , UPC: 851019008484 , Code: 3HE-OIR-OFFF-UD10880

Ultradyne C4 Offset Flip-Up Front/Rear Sight Set Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, Ultradyne C4 Offset Flip-Up Front/Rear Sight Set, Right Hand, Black, UD10880 , MPN: UD10880-DEMO , Code: 3HE-OIR-OFFF-UD10880-DEMO
  • Ultradyne C4 Offset Flip-Up Front/Rear Sight Set, Brown, US10890 , MPN: US10890 , Code: 3HE-OIR-OFFF-US10890
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