The BMP-23 (бойна машина на пехотата) is a Bulgarian infantry fighting vehicle which was first introduced in the early 1980s. Despite its name, the BMP-23 is very different from the BMP-1 and more similar to BMP-2. The hull is based around that of the Soviet 2S1 "Gvozdika", but with thicker armour and a more powerful diesel engine. Since the "Gvozdika" is a larger vehicle, the troop transport compartment isn't as cramped as that of the BMP-1. The armour is cast steel, capable of withstanding heavy machine gun fire. The turret is armed with a 23-mm autocannon 2A14 from the air-defence gun ZU-23-2 with 600 rounds, and initially an ATGM launcher for the 9K11 Malyutka, today with 9K111 Fagot ATGM.