The HiViz AR Vertical Tritium Front Sight (Model ARN101) is a drop-in replacement front sight post designed to boost low-light shootability on AR and M4 rifles. Built around a bright green tritium element, this sight gives you a glowing aiming point in darkness or dim conditions—a real advantage for hunters navigating pre-dawn or dusk approaches, or shooters working indoor ranges. If your rifle runs an A-frame or folding front sight base, the ARN101 will likely be a straightforward swap.

Tritium sights glow without batteries or activation; they're always ready. That makes them popular with hunters who want reliable aiming capability regardless of light, and with shooters who value simplicity and durability. The vertical post profile is the standard AR configuration, so mounting is intuitive if you're already familiar with the platform.

The package includes an adjustment tool and detent hardware to secure your new sight post properly. Keep in mind that this sight is designed for A-frame and folding sight bases found on most AR and M4 builds—it does not fit Magpul BUIS models, so double-check your existing hardware before ordering. If you're upgrading from a standard black post or adding tritium to a new build, this is a solid choice for hunters and shooters who want better visibility when light is low.

Key Features

• Green tritium sight post—glows in low light without batteries
• Fits most AR and M4 rifles with A-frame or folding front sight bases
• Works with both fixed and detachable sight configurations
• Includes adjustment tool and detent for secure installation
• Vertical post design—standard AR configuration

Specifications

Product Name	HiViz AR Vertical Tritium Front Sight
Model	ARN101
Brand	Hi-Viz
Sight Type	Front sight post with tritium element
Post Color	Green
Compatibility	AR and M4 rifles with A-frame or folding front sight bases (fixed or detachable); does not fit Magpul BUIS
Included Accessories	Adjustment tool, detent

Frequently Asked Questions

Will the ARN101 work with my Magpul BUIS?

No. The HiViz AR Vertical Tritium Front Sight is not compatible with Magpul BUIS models. It is designed for A-frame and folding front sight bases commonly found on standard AR and M4 rifles.

Does tritium glow in the dark without a battery?

Yes. Tritium is self-illuminating and requires no external power or activation. The sight post will glow in low-light conditions as part of its natural properties.

What's included in the box?

The ARN101 comes with an adjustment tool and detent hardware to help you install and secure the sight post properly.

Can I use this sight with both fixed and detachable front sight bases?

Yes. The HiViz AR Vertical Tritium Front Sight works with both fixed and detachable A-frame or folding sight bases on AR and M4 platforms.