HiViz ARn21 Folding AR Back-Up Sight - Precision Folding Iron Sight for AR Platforms

The Hi-Viz ARn21 folding AR back-up sight is a practical insurance policy for any AR-15 platform rifle. When your optic goes down or you need a quick, non-magnified sight picture, this dual-aperture rear sight and tritium front post give you a dependable way to keep shooting. It mounts directly to standard 1913 Picatinny rails, integrating seamlessly with your existing setup without permanent modifications.

Built for shooters who run optics as their primary but refuse to be caught without a backup plan, the ARn21 folds flat when not in use, staying out of your line of sight and reducing snag points. The green tritium front sight post is visible in low light, and the dual-aperture rear allows you to choose between a wider notch for speed or a tighter aperture for precision depending on your distance and lighting conditions. Both elevation and windage are adjustable, so you can dial it in to your preferred zero rather than hope it's close enough.

Whether you're building a duty rifle, hunting setup, or competition gun, having accessible backup iron sights on a combat-ready platform is just sound practice. The Hi-Viz ARn21 does the job without the bulk or cost of premium options, making it a sensible choice for operators who want reliability without overthinking it.

Key Features

• Green tritium front sight post for low-light visibility
• Dual-aperture rear sight for speed and precision shooting
• Folding design stays out of the way when not needed
• Elevation and windage adjustments for precise zeroing
• Fits all standard 1913 Picatinny rail systems
• No permanent modifications required

Specifications

Frequently Asked Questions

Will the Hi-Viz ARn21 work on my AR-15?

Yes, as long as your AR-15 has a standard 1913 Picatinny rail on the receiver. The sight mounts directly to any Picatinny-equipped AR platform without modification.

What's the advantage of backup iron sights?

Backup irons give you a non-magnified, mechanical way to engage targets if your primary optic fails, gets knocked loose, or runs out of battery. On a fighting or hunting rifle, they're a simple failsafe that weighs almost nothing and takes up minimal space when folded.

Can I adjust the zero on the ARn21?

Yes. Both elevation and windage are adjustable, so you can dial the sight in to your preferred zero rather than guessing. This makes it practical to use as a true backup rather than just a "maybe it's close" option.

Does the tritium front sight glow in the dark?

Green tritium is a self-illuminating isotope that glows in low-light and dark conditions without requiring batteries or activation. It's useful for early-morning or evening shooting where ambient light is low.