The STG 77 1.5x Riflescope is nearly an exact replica of the optics used on the original AUG rifles. It features the same profile, integrated backup sights, and weight as the original. The "Donut" reticle has been upgraded with a pin-point center dot for more accurate aiming at range and the support struts have gotten slight buttressing to increase durability. This optic mounts directly into the receiver of the AUG A3 M1, but can be easily switched back out with the rail. Features: Nearly an exact replica of the optics used on the original AUG riflesSame profile, integrated backup sights, and weight as the originalMounts directly into the receiver of the AUG A3 M1NOTE: Compatible with the AUG A3 M1 rifle ONLY Steyr Arms Steyr STG 77 1.5x Riflescope for AUG M3 M1 1252020517