 In concept, it is similar to the Soviet Dragunov sniper/designated marksman rifle.While the design of the M91 is based upon an elongated version of the AK-47 design just like its predecessor, the Zastava M76, the M91 features several modifications, bringing it closer to the Dragunov rifle.The separate stock and pistol grip used on the M76 have been replaced with a thumbhole stock made of synthetic polymer material resembling that used on the Russian rifle.