Fits Romanian, Bulgarian, Chinese and US AKs and variants, including models with oversized barrel/rear sight block; Rugged aircraft aluminum alloy construction with precision CNC Machining; Four Mil-spec Picatinny rails with integrated QD swivel housings on left/right rails; Simple and friendly installation, no gunsmith or tool required; Solid locking features for most secure fit; Ultimate tactical solution to enhance accuracy under toughest environments; Hardcoat anodized finish for wear resistance; Black rubber rail guards included; Proudly made in USA with superb design and production; NOTE: Use the Allen wrenches included with this product to tighten all screws.