Description
Ultradyne built the C2 Combo around one clever idea: instead of a single aperture and a front post, you look through a rear ghost ring and center a 12 MOA aperture ring up front. Your eye naturally lines the two circles up, which gives you a fast, clean sight picture without a post covering the target. You end up seeing all of what you're aiming at, and target-to-target transitions feel quicker because there's less to line up in your head.
Both units are fully CNC machined in the USA from 416 stainless steel and aircraft-grade aluminum, so the set stays light while shrugging off recoil and rough handling. The whole combo runs right around 3.9 ounces, and each sight sits about a half inch above the rail when folded, so it tucks down low enough to clear most optics and mounts. Deployment is one-handed thanks to a positive detent that snaps the sights up or down without fussing with buttons or latches.
Dialing In the C2 Folding Combo
Zeroing is refreshingly simple. The front sight handles both windage and tool-less elevation, and the rear sight carries an oversized positive-click windage knob that gives you the full range of adjustment back for a true center zero. That oversized knob does double duty as storage: it threads in and holds the spare .070 aperture until you want to run it in the ghost ring. Knobs are chunky enough to turn easily but tucked in so a snag or a bump won't knock your zero.
What Sets the C2 Combo Apart
Users who've run a lot of backup irons tend to single out the dual-aperture concept as the standout here, and it's the reason these get picked over more traditional flip-ups. The set mounts to any standard 1913 Picatinny rail and plays nicely with fixed and railed gas blocks that sit on the same plane as the receiver, which makes it a solid choice for AR-pattern rifles and similar long guns. If you want irons that are quick, clear, and built like a tank, the C2 earns its spot.
Key Specifications
- Manufacturer: Ultradyne USA
- Model: C2 Folding Combo Aperture
- Manufacturer Part Number: UD10014
- UPC: 851019008880
- Sight Type: Folding front and rear iron sight combo
- Front Aperture: 12 MOA
- Rear Aperture: 0.070 in threaded ghost ring
- Adjustments: Front windage and tool-less elevation; rear positive-click windage
- Mount: MIL-STD-1913 Picatinny rail
- Construction: 416 stainless steel and aircraft aluminum, CNC machined
- Total Weight: Approx. 3.9 oz
- Height Above Rail (folded): 0.5 in each
- Color: Black
- Country of Origin: USA
What’s Included
- C2 folding front sight
- C2 folding rear sight
- 12 MOA front aperture
- Spare .070 rear aperture (stores in windage knob)
Frequently Asked Questions
How does the dual-aperture setup on the C2 Combo work?
You look through the rear ghost ring and center the 12 MOA aperture ring on the front sight inside it. Your eye lines up the two circles automatically, which speeds up acquisition and keeps a post from covering your target. The result is a clear sight picture where you can see the whole target rather than blocking part of it.
Will the Ultradyne C2 sights fit my rifle?
The C2 Combo mounts to any standard MIL-STD-1913 Picatinny rail, so it works on most AR-pattern rifles and other long guns with a rail. It also plays well with fixed or railed gas blocks as long as the gas block and receiver rail sit on the same plane. If your setup has a continuous top rail, you're good to go.
Do these sights fold down low enough to clear an optic?
Yes. Each sight sits about a half inch above the rail when folded, so they tuck under most magnified optics and red dots to serve as backups. When you need them, the positive detent flips them up one-handed with a solid snap and no buttons to fuss with.
Where does the spare aperture go on the C2 Combo?
The oversized rear windage knob is threaded to hold the spare .070 aperture, so it stays with the sight until you want to run it in the ghost ring. It's a tidy way to keep your backup aperture from getting lost. Swapping between the two is quick and requires no extra tools to store.






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