LUTH-AR UR-21A REAR BASE SIGHT ASSY A1

The Luth-AR UR-21A Rear Base Sight Assembly A1 is a no-frills rear sight base built for AR-15 rifles that value simplicity and reliability. If you're running an A1-pattern upper receiver and need a straightforward, dependable rear sight solution—whether for a budget build, a retro setup, or a duty rifle where iron sights are non-negotiable—this assembly delivers the fundamentals without overcomplication. It's the kind of component that works the way it's supposed to, year after year.

This rear base sight assembly integrates directly into A1-configured AR platforms, giving you a solid backup sighting system or primary iron option depending on your optic setup. Whether you're building an entry-level rifle, restoring a classic AR, or adding iron redundancy to an already-scoped gun, the UR-21A slots in without fuss. It's designed to work as part of your rifle's sighting ecosystem, not to reinvent the wheel.

Luth-AR has built a reputation for no-nonsense AR parts, and this rear sight base reflects that ethos: solid, compatible, and ready to function. Pair it with a quality front post and you've got a capable sight picture for hunting, range work, or training where you want irons you can trust.

Frequently Asked Questions

Will this rear sight base fit my AR-15?

The UR-21A Rear Base Sight Assembly A1 is designed for A1-pattern upper receivers. Confirm your upper is A1-compatible before ordering to ensure proper fitment.

What's included in this assembly?

You receive the rear base sight assembly itself. This is the base unit; refer to the product details to confirm all components included in the package.

Can I use this sight on a rifle with a scope?

Yes. Many shooters install iron sights as a backup to optics. As long as your upper and lower are properly aligned, the UR-21A can coexist with your optic setup, giving you irons as a redundancy option.