This US made AAM-47SF Premium Receiver Khyber Pass Model is designed to accept most standard Triangular Side Folders. These have the nice Black oxide finish & were built to the specifications to match the strength and quality of the original factory  Military 7.62x39 Receivers.  These are professionally built to correct specifications and Fully Heat Treated to insure solid AK build & proper function .They also feature the much sought after Pistol Grip Reinforcement plate that enhances the rigidity of the Pistol grip area and reduces the likelihood of damage should you drop the AK on the pistol grip .