The Luth-AR UR-21A Rear Base Sight Assy A1 is a complete A1-style rear sight assembly designed for AR-platform rifles such as the AR-15 and AR-10. Built from durable steel with a matte black finish, it provides the classic fixed rear sight look while delivering dependable alignment and repeatable windage adjustments for retro builds or replacement projects.

This assembly is ideal for shooters finishing a stripped A1 upper, refreshing a worn rear sight, or adding a solid iron backup to a modern AR. The integrated windage drum offers precise click adjustments without special tools, and the included flat spring and small parts simplify installation. It’s a practical choice for range use, training, and general-purpose shooting, backed by Luth-AR’s reputation for thoughtful AR components and consistent quality.

Key Features:

• Manufacturer: Luth-AR
• Model: UR-21A Rear Base Sight Assy A1
• Material: Steel
• Finish Color: Matte Black
• Condition: New
• Firearm Fit: AR Platform (AR-15 / AR-10)
• Sights: A1 Rear Sight Assembly With Windage Drum
• Includes: Flat Spring And Complete Rear Sight Components
• Weight: 0.02 lbs