Luth-AR A2 Rear Sight Kit for AR-15 A2 Upper Receivers – Complete Assembly, Black (UR-21K)

• Complete A2 rear sight kit designed for AR-15 A2 upper receiver installation
• Includes aperture, windage knob, elevation components, springs, pins, and mounting hardware
• Provides adjustable windage and elevation control for precise iron sight alignment
• Black finished components match standard AR-15 rifle sight assemblies and upper receivers
• Kit requires user assembly before installation onto compatible A2 pattern receivers
• Designed as replacement or build kit for rifle sight system restoration or upgrades

The Luth-AR A2 Rear Sight Kit is a rifle sight kit designed for assembling a rear sight system on A2 upper receivers for AR-15 rifles.

This Luth-AR A2 rear sight kit includes multiple components such as the rear sight aperture, windage knob, elevation knob, springs, pins, and base elements required for assembly. The kit fits AR-15 A2 upper receivers and installs into the integrated carry handle sight housing. This product is used for building or restoring rear sight systems with adjustable windage and elevation settings. The components are sized for A2 receiver specifications and align with standard installation points. In typical setups, the assembled sight provides a mechanical aiming reference for rifle use. The kit requires assembly and supports consistent fitment within A2 upper receiver configurations.