The Luth-AR A2 Rear Sight Assembly Kit (brand part no. UR-21K) gives builders and gunsmiths everything needed to add a proper A2-style rear sight to an A2 upper receiver. This is a complete kit rather than a bare sight body, so the small detents, springs, and hardware that are easy to lose or overlook are already included. Some assembly is required to put the kit together and mount it correctly, making this a good fit for a builder comfortable with basic small-parts fitting or a gunsmith finishing out a retro or Mil-Spec A2 upper.

Key Specifications

• Mounts to an A2 upper receiver.
• Sold as a complete kit rather than a bare sight body.
• Requires assembly to install.

Frequently Asked Questions

Does this kit require assembly? Yes, this kit requires assembly and mounts to an A2 upper receiver.

Will this fit any AR-15 upper? It’s built specifically for A2-style upper receivers with the correct rear sight housing.

Does the kit include all mounting hardware? Yes, it’s sold as a complete kit with the parts needed for assembly.

Buy the Luth-AR A2 Rear Sight Assembly Kit

Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door, and finish out your A2 upper the right way.

Shop more from Luth-AR and browse our full AR upper parts selection.