Its main armament consists of a 76.2 mm D-56T series rifled tank gun, which has an effective range of approximately 1,500 meters and a rate of fire of six to eight rounds per minute. This gun is 42 calibers long. The PT-76 carries 40 rounds for its gun. A typical ammunition load consists of 24 x OF-350 Frag-HE, 4 x AP-T, 4 x API-T and 8 x BK-350M HEAT rounds (with AP-T rounds substituted for HVAP when available). The gun is mounted in an oval dish-type circular truncated cone turret with flat, sloping sides which is mounted over the second, third, and fourth pair of road wheels. All PT-76s have a fume extractor for the main gun at the rear of the turret.