 The AK-63 F and D (AMM and AMMS) are both nearly identical externally to the USSR-manufactured AKM and AKMS.The main difference is that the AK-63 series retains the distinctive-looking straight pistol grip of the AKM-63.The forward hand grip of the AK-63 also lacks the palm swells which characterize the Soviet AKM (and most AKM copies made in many other countries).