In 1933 a new turret was fitted to the T-26 which extended over the width of the hull. This was designed by the Bolshevik Leningrad factory and KhPZ Kharkov works. The turret could mount a 45 mm Model 1932 gun.
A 37 mm BS 3 (1930 model) was installed as the main armament for the T-26 Model 1932.
The T-26 Model 1933 had a 45 mm gun installed.
The seats of the loader and commander were welded in place to the floor.
When traveling over rough terrain the gun was very hard to aim as the gun and turret weren't properly balanced.