Description
This is the steel version of the OEM front flip-up sight that ships standard on the Kriss Vector and Defiance platforms, so you know it has already earned its keep in the real world. When folded, it sits just 0.50 inches (12.7mm) above the rail surface, which means it stays completely below the line of a red dot or LPVO and won't clutter up your sight picture. Flip it up and you get a clean, repeatable front reference backed by all-steel construction.
What Sets the Defiance Steel Front Sight Apart
The standout here is the elevation adjustment range. This sight gives you a wide 50 MOA of travel, which is a big deal if you're running it across different setups with varying height-over-bore or sight radius numbers. Adjustments come in at 0.5 MOA per click referenced to a 14.5-inch sight radius, and the top of the post measures a fine 0.059 inches (1.5mm) for a precise aiming point. The large, textured adjustment knob is the kind of touch you appreciate in the field, letting you make elevation changes with gloved hands without fumbling.
Mounting the Kriss Defiance Front Flip-Up
The base clamps onto any MIL-STD 1913 Picatinny rail, so it drops onto AR-platform rifles and plenty of other Pic-railed hosts without drama. Kriss recommends torquing the mounting screw to no more than 2 Nm (about 17.7 in-lb), so snug it up to spec and it'll hold zero without stressing the hardware. At right around half an ounce, it adds practically nothing to your build.
Whether you're running it as a dedicated backup behind glass or as a primary iron up front, the steel build is the reason to reach for this one over a polymer folder. It's a compact, no-nonsense front sight from a company that puts these on its own guns.
Key Specifications
- Manufacturer: Kriss USA
- Manufacturer Part Number: DA-FSBL00
- UPC: 810237026519
- Style: Low Profile Flip-Up
- Fits: AR-15 / MIL-STD 1913 Picatinny Rail
- Material: Steel
- Color / Finish: Matte Black
- Elevation Adjustment: 50 MOA
- Click Value: 0.5 MOA per click at 14.5" sight radius
- Front Post Width: 0.059" / 1.5mm
- Height Folded: 0.50" / 12.7mm above rail
- Length Folded: 2.0" / 50.8mm
- Width at Base: 1.19" / 30.2mm
- Weight: 0.5 oz
- Mounting Torque: 2 Nm (17.7 in-lb) max
What’s Included
- Kriss USA Defiance low profile steel front flip-up sight
- Mounting hardware
Frequently Asked Questions
Will the Kriss Defiance front sight co-witness with my red dot or optic?
Because it folds down to just 0.50 inches above the rail, it clears the sight picture of most red dots and low-power optics when stowed. When flipped up it stands at standard AR front sight height, so it's designed to pair as a backup iron behind your glass. As always, verify the height matches your specific optic and rear sight setup before you count on a co-witness.
What rifles does this Defiance flip-up front sight fit?
It mounts to any MIL-STD 1913 Picatinny rail, which covers AR-15 platform rifles as well as the Kriss Vector and Defiance family it was originally designed for. If your handguard or gas block rail is standard Picatinny, this sight will clamp right on. Just make sure you have enough rail real estate at the front for proper sight radius.
Is this the steel version or the polymer version?
This is the all-steel version, part number DA-FSBL00. Kriss also offers a polymer variant, but the steel build gives you extra durability and heft for hard use. If long-term ruggedness is your priority, the steel is the one to grab.
How much elevation adjustment does the Kriss Defiance front sight offer?
It has a wide 50 MOA range of elevation travel, adjustable in 0.5 MOA clicks referenced to a 14.5-inch sight radius. That generous range lets you zero it across a variety of height-over-bore and sight radius configurations. The oversized textured knob makes those adjustments easy, even with gloves on.





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