Gorchak Universal pillbox.
It is intended for quickly bolstering defensive positions. The Gorchak is basically a steel turret with a AGS-17 grenade launcher (360 rounds), a NSV-12 heavy 12.7mm machine gun (480 rounds), a Type PKM light 7.62mm machine gun (1700 rounds), and a single ATGM (type can vary). The underground component is four steel pillars; the surrounding soil has to be buttressed with lumber or sheet metal. The whole turret can rotate 360 degrees. The Gorchak has a diameter of 76 and a length of 61, of which most is underground. The disassembled system weighs 4 tons and heavy construction vehicles are required for its installation.
there is also a smaller version called Type 3SM-1
This is a smaller cousin to the Gorchak, equipped with just an ATGM. (see below)