For air-to-air combat, the Su-57 is expected to carry four beyond-visual-range missiles in its two main weapons bays and two short-range missiles in the wing root weapons bays. The primary medium-range missile is the active radar-homing K-77M ("izdeliye" 180), an upgraded R-77 variant with AESA seeker and conventional rear fins. The short-range missile is the infrared-homing ("heat seeking") K-74M2 ("izdeliye" 760), an upgraded R-74 variant with reduced cross-section for internal carriage. A clean-sheet design short-range missile designated K-MD ("izdeliye" 300) is being developed to eventually replace the K-74M2. For longer ranged applications, four large "izdeliye" 810 beyond-visual-range missiles can be carried, with two in each main weapons bay. Reportedly, the fighter will also be able to carry the long–range hypersonic R-37M missile.