Kriss USA Defiance Rear Flip-Up Sight — Low-Profile Steel, Black (Model DARSBL00 / UPC 810237026502)

Upgrade your AR-15’s optics backup and iron-sight capability with the Kriss USA Defiance Rear Flip-Up Sight (DARSBL00). Built to deliver rock-solid performance, low-profile concealment behind optics, and fast, repeatable deployment, this rear sight is a purpose-designed solution for shooters who demand durability, precision, and seamless co-witness with red dots or magnified optics. Machined from steel and finished in matte black, the Defiance rear flip-up pairs modern tactical geometry with straightforward, battle-ready functionality.

Overview — what makes the Defiance rear sight special

The Kriss Defiance Rear Flip-Up Sight is a low-profile, steel backup iron sight (BUIS) engineered for AR-15 platforms. When stowed, it sits low behind optics for minimal obstruction and a clean sight picture; when needed, it flips up quickly to provide an adjustable rear aperture for precise aiming. The sight’s steel construction, tactile controls, and robust locking mechanism guarantee that it stays put under recoil and returns to zero after deployment.

Key Features & Benefits

• Model: DARSBL00 (Defiance Rear Flip-Up Sight)

• UPC: 810237026502

• Construction: Heat-treated steel body for superior strength and longevity compared to polymer alternatives.

• Finish: Matte black corrosion-resistant finish for low glare and long life.

• Low-Profile Design: Sits low behind most optics when stowed, minimizing cheek-weld interference and preserving sight lines.

• Quick-Deploy Flip Mechanism: Positive, spring-assisted flip-up action allows rapid one-handed deployment in seconds.

• Secure Locking: Robust locking detent eliminates wobble and maintains zero under repeated recoil cycles.

• Aperture Options: Precision rear aperture for accurate sight picture; compatible with front post or fiber-optic sights.

• Windage Adjustment: Tool-free or simple screwdriver/coin windage adjustment for precise lateral zeroing (confirm adjustment method in product instructions).

• Low Profile When Deployed: Even when raised, engineered geometry keeps the optical sight picture compact and intuitive.

• Universal Fit: Designed to mount on standard Picatinny/1913 rails — drop-in installation behind red dots, holographic sights, or magnified optics.

• Durability: Steel build resists deformation and wear from frequent use and environmental exposure.

Performance & Use Cases

The Kriss Defiance Rear Flip-Up is ideal for shooters who run optics but want a reliable iron-sight backup without the bulk of taller, fixed sights. Use cases include:

• Back-up to Red Dot/Holographic Sights: Rapid transition to irons if electronic optics fail or battery dies.

• Co-Witness Setups: Designed to sit low behind micro or full-size optics for absolute or lower 1/3 co-witness configurations.

• Tactical & Duty Rifles: Built tough for patrol, duty, and professional applications where dependability matters.

• Competition & Training: Practical for 3-Gun, PCC, and stage shooting where you may need a fast, repeatable iron option.

• Hunting & Field: Rugged construction helps survive rough handling and environmental exposure on the trail.

Installation & Adjustment (High-Level)

• Mounting: Secure the sight to any standard Picatinny/1913 rail using the integrated clamp or mounting hardware. Ensure the rail area is clean and free of debris for best contact.

• Stow/Deploy: When not in use, push the sight down until it locks into the stowed position. Deploy with a quick push on the flip lever or spring assist — it should lock firmly in the ready position.

• Zeroing: Use the windage adjustment to align the rear aperture with your front sight or optic. Confirm zero at short range, then verify at your preferred engagement distance.

• Maintenance: Periodically check mounting screws and the locking detent for tightness; apply a light, corrosion-inhibiting lubricant if operating in wet or salty environments.

Note: For precise torque values or detailed mechanical servicing, consult Kriss USA instructions or a qualified armorer.

Durability & Materials

Constructed from hardened steel with a matte black finish, the Defiance rear sight excels in longevity and resistance to abuse. The steel body resists crack and deformation under hard use — a key advantage for users who push gear through heavy training cycles or harsh field conditions. The low-reflectivity finish reduces glare for stealthier operation and improved sight acquisition in bright sunlight.

Who the Defiance Rear Sight is for

• Tactical operators and law enforcement who require a dependable iron backup that won’t fail when electronics do.

• AR builders and enthusiasts seeking a low-profile steel sight that complements modern optics.

• Competitive shooters who want a compact, fast-deploying rear sight for backup or transitional stages.

• Hunters and outdoorsmen looking for rugged reliability in inclement weather or rough handling.

• Anyone running a red dot or magnified optic who wants a rock-solid, low-profile rear iron that preserves cheek weld and sight picture.

Technical Specifications (Quick Reference)

• Manufacturer: Kriss USA

• Model: Defiance Rear Flip-Up Sight (DARSBL00)

• UPC: 810237026502

• Material: Heat-treated steel

• Finish: Matte black corrosion-resistant coating

• Mounting: Picatinny / MIL-STD-1913 rail compatible

• Design: Low-profile, flip-up rear aperture sight

• Adjustments: Windage (tool-assisted/tool-free depending on spec)

• Deployment: Spring-assisted flip-up with secure detent lock

• Weight: Lightweight for a steel sight—adds minimal mass while maximizing durability

SEO-Friendly Product Summary

The Kriss USA Defiance Rear Flip-Up Sight (DARSBL00) is a low-profile steel rear backup sight for AR-15 rifles, offering fast deployment, secure locking detents, windage adjustment, and a matte black finish. Designed to co-witness with optics and mount on Picatinny rails, it provides a durable, repeatable iron-sight solution for tactical, hunting, competition, and duty applications. Model DARSBL00 / UPC 810237026502.

Equip your rifle with a dependable, low-profile backup: the Kriss Defiance Rear Flip-Up Sight gives you the strength of steel, the convenience of quick deployment, and the confidence of a sight that holds zero when you need it most.

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