Luth-AR Retro A1 Rear Sight Assembly Features The Luth-AR Retro A1 Rear Sight Assembly is designed as a direct complete upgrade for AR-style rifles using A1 pattern upper receivers giving the rifle an authentic retro windage drum sight in place of a modern adjustable sight. The Retro Style Rear Sight Windage Drum allows the shooter to make precise windage corrections while keeping the classic look and feel of the earliest AR-platform rifles. A fixed sight design keeps the assembly simple and rugged with fewer moving parts than a dial-adjustable modern rear sight. Finished entirely in black the assembly matches factory A1 upper receivers for a consistent period-correct appearance. This assembly ships as a complete kit including the rear sight aperture rear sight windage screw rear sight detent and detent spring a rear sight base roll pin and a rear sight flat spring so the shooter has every part needed for a full installation without hunting down individual pieces. Constructed from steel the assembly is built to handle the recoil and vibration of repeated firing without losing its windage zero. Measuring roughly 5 inches long by 3 inches wide and 1 inch tall it fits directly onto A1 upper receivers on AR-15 M16 and M4 pattern rifles. For builders assembling a retro-styled AR-15 this Luth-AR Retro A1 Rear Sight Assembly provides an authentic complete sight solution. Luth-AR Retro A1 Rear Sight Assembly Specifications Manufacturer: Luth-AR Model: Retro A1 Rear Sight Assembly Compatible Hosts: AR-15 A1 Upper Receivers Color: Black Sight Style: Fixed Material: Steel Overall Length: 5 Height: 1 Width: 3 Includes: Windage Drum Aperture Detent Spring Roll Pin Flat Spring Available At: GrabAGun