is a manually loaded, towed 152 mm gun-howitzer artillery piece, manufactured in the Soviet Union during the 1950s.

9 in Sverdlovsk, now Motovilikha Plants in Yekaterinburg, led by the eminent artillery designer Fyodor Fyodorovich Petrov, who was responsible for several World War II pieces.

The D-20 has a 26 caliber (3.962 m) barrel, with a double baffle muzzle brake and a semi-automatic vertical sliding-block breech, with a tied jaw and the block moving down to open.

The breech has a projectile retaining catch to prevent the shell sliding out at higher elevations before it is rammed with a manual rammer.

Box girder section split trail legs are hinged to the cradle support, with bolts to lock them into either the open or closed position.

The cradle support has a bolt for locking the barrel in the centre for traverse before towing the gun.

To assist with all-round carriage traverse, there is a pivot jack mounted at the front of the cradle support.

As was normal for the period, the gun has a shield, including a folding piece below the cradle support.

The centre section of the upper shield slides both up and down, and folds to accommodate the barrel at higher elevation angles of fire.

Like most Soviet artillery, the gun fires separate ammunition using metal cartridge cases that also provide obturation.

Later projectiles include bomblet, anti-personnel land mine, flechette, Krasnopol precision-guided munition (PGM), communication jammer, and extended range HE using rocket assistance (RAP).

In Soviet service, the 5,700 kg gun was usually towed by a URAL-375 6×6 truck or, in some regions, an AT-S or AT-L medium tractor.