One prototype, developed in 1945. It used elements of the IS-2 and IS-3 tanks. The overall height of the vehicle was reduced to 2240 mm, which was compensated with an increased width of the superstructure. The factory designation was Object 704 (Объект 704). It was armed with the 152.4 mm ML-20SM model 1944 (МЛ-20СМ обр. 1944 г.) gun-howitzer, with a barrel length of over 4.5 meters (29.6 calibers) and no muzzle brake, which further increased the firepower of the gun. It had a maximum range of 13,000 meters. The self-propelled gun carried 20 rounds of two piece (shell and charge) armor-piercing and high explosive ammunition. The secondary armament of the fighting vehicle consisted of two 12.7 x 108 mm DShK machine guns, one anti-aircraft and one co-axial. Item No 05575 Item Name Soviet project 704 SPH Bar Code 9580208055756 Scale 1:35 Item Type Static Kit Model Brief Length: 244.5mm Width: 97.7mm Total Parts 460+ Metal Parts n/a Photo Etched Parts 1 piece Film Parts n/a Resin Parts n/a Total Sprues 27 sprues , lower hull and upper hull Released Date 2014-03 More Features "The kit consists of over 460 parts >the kit w/refined detail >multi-slide moulded lower hull >192 individual tracks links >photo-etched parts included"