In 1937, the Soviet military delegation visited the factory firm Skoda in Czechoslovakia. The purpose of the visit was to acquire documentation and prototypes artillery systems of high power for their subsequent production in Soviet factories. Attracted the attention of military projects 210-mm guns and 305-mm howitzers - both guns had separate-loading sleeves and horizontal wedge gate. Carriages were also identical. In principle, the system differed only trunks: at gun he was leynirovanny, while howitzers - bonded.
signed agreement provides for certain changes in the projects. In particular, at the request of the Soviet representatives were introduced kartuznoe loading and steel piston valves. Instead bonded barrel howitzer used leynirovanny. Two prototypes guns Czech company undertook to provide the USSR in December 1939, but came much earlier drawings. Therefore, in order not to lose time, it was decided to begin production of artillery systems, without waiting for delivery prototypes. To simplify production technology plant engineers Barricades substantially reworked drawings. 305 mm howitzer domestically manufactured, labeled Br-18, entered the field testing of the fall of 1940 and showed in general, satisfactory results. It was noted that a weapon capable of firing explosive shells weighing 330 kg at a distance of 16 500 m, and concrete-piercing projectiles weighing 465 kg were flying distance 13100 m Mass production howitzers was interrupted with the beginning of the Great Patriotic War, and the exact number received by the units of the Red Army, unknown. But at least three 305-mm guns took part in fighting in the separate artillery battalions special power RGC. Like all heavy artillery system, they were used in the second period of the war. One of the howitzers Br-18 is currently in an artillery museum city on the Neva.