152 mm /55 Italian naval gun Models 1934 and 1936

The 152 mm /55 Model 1934–1936 were built for the Italian Navy in the years before World War II. These guns were used on the Duca degli Abruzzi-class Light cruisers, which were the final series of the Condottieri-class cruisers as their primary armament and as secondary armament on the Littorio-class battleships.

Construction
The Model 1934 was designed and manufactured by Ansaldo, while the Model 1936 was manufactured by OTO Melara. The Model 1934's made by Ansaldo were of monobloc construction with a horizontal sliding breech block, while the Model 1936's made by OTO Melara were constructed of two tubes, a loose liner and a horizontal sliding breech block. Both models fired the same quick firing separate loading ammunition. The gun mounts had electrically powered training, elevation and hoists. There were telescopic pneumatic rammers and each gun had a separate cradle. Loading was at any angle up to +20° for both the twin and triple mounts. These guns were considered a significant improvement over the earlier 152 mm /53 Models 1926 and 1929 guns in that they had a lower muzzle velocity, were more widely spaced in the turrets and had separate gun cradles. Dispersion was still a problem, but the problem wasn't inherent flaws in the guns or their mounts. Instead poor shell aerodynamics and poor ammunition quality control was at fault.

Naval Service
Ansaldo Model 1934 guns were mounted triple wing turrets on the Littorio, and in triple and twin superfiring turrets forward and aft on the Duca degli Abruzzi-class. OTO Melara Model 1936 guns were mounted in triple wing turrets in the Vittorio Veneto and Roma.

Ammunition
Ammunition was of quick fire separate loading type. The AP projectile was 63 cm long with a cartridge case and a bagged charge which weighed 16.35 kg.

The gun was able to fire:
 * Armor Piercing - 50 kg
 * High Explosive - 44.4 kg

Weapons of comparable role, performance and era

 * BL 6 inch Mk XXIII naval gun : British equivalent
 * 15 cm SK C/25 : German equivalent light cruiser gun
 * 15 cm SK C/28 : approximate German equivalent
 * 15.5 cm/60 3rd Year Type : slightly larger Japanese equivalent
 * 6"/47 caliber Mark 16 gun : US equivalent light cruiser gun