Luth-AR UR-21A A1 Rear Base Sight Assembly - AR-15

The Luth-AR UR-21A is an A1-style rear base sight assembly purpose-built for AR-platform rifles. Designed as a quality, low-cost upgrade or replacement, this rear sight mounts to an A1-pattern AR-15 or AR-10 upper receiver and is a proven choice for retro builds, fixed-sight builds, and rifles in need of a dependable iron-sight back-up.

The UR-21A features an integrated windage adjustment knob, letting shooters dial in their zero without specialty tools. Its clean, low-profile A1-style design keeps the sight tucked close to the handguard while maintaining the classic fixed-rear-sight look favored on traditional AR-pattern rifles. The sight is manufactured in the USA and ships complete with the included flat spring needed for installation.

Whether you are finishing a stripped upper, building a classic A1-pattern rifle, or simply replacing a worn or missing rear sight, the Luth-AR UR-21A A1 Rear Base Sight Assembly is an easy, dependable, and budget-friendly solution.

Manufacturer: Luth-AR
MPN: UR-21A