For all common stamped receiver AK’s. Such as Chinese Type 56 and MAK 90 (square cut receivers only), Romanian SAR, Hungarian, Russian/ Saiga, Egyptian Maadi. Length extends 1.535” ‘from the back edge of receiver. AKRBU is drilled and tapped in two places to allow the stock to be mounted higher for use with optical sights. Includes a 1 1/4” sling mount which can be mounted on the left or right of the rifle. Weight (6.42 oz).