sentences:  Decisions were made to start domestic production of new large caliber guns.In same time construction documentation of 152 mm towed gun-howitzer M1955 (D-20) with few D-20 guns was bought from the Soviet Union.Dissatisfied with a range of both US 155mm and Soviet 152mm gun and after analyzing both US 155mm and Soviet Union 152mm guns and considering the lack of desired features, a number of specifications were defined with characteristics that new domestic gun-howitzer should have