76-mm Regimental Gun M-27 Details
In 1943, the design bureau of the Motovilikhinsky artillery plant named after. VM Molotov No. 172 (Perm) began work on the creation of a new gun to replace the 76-mm regimental cannon of the 1943 model. The new 76-mm regimental cannon, which received the factory designation “M-27”, had the ballistics of the 76-mm divisional gun ZIS-3 of the 1942 model, which brought it on a par with divisional guns in terms of combat qualities.
The M-27 was a cannon of a modern design for that time. It was designed according to the classical scheme and consisted of a barrel – a monoblock with a screw-type breech and a vertical wedge, semi-automatic bolt borrowed from the ZIS-3 and a carriage with sliding stamped box-type beds. A very powerful two-chamber muzzle brake was mounted on the barrel, which received an additional reflector of powder gases to increase the area. The muzzle brake absorbed up to 64% of the recoil energy. The semiautomatic shutter of the mechanical (copy) type was close to the 45-mm anti-tank gun M-42. The opening of the wedge and the extraction of the spent cartridge case took place when the barrel was rolled in an area of 340 – 400 mm from the beginning of the roll.
The recoil devices consisted of a spindle-type hydraulic recoil brake and a spring-type recoil brake. The upper machine of sheet, stamped-welded structure, the lower machine of the cast tubular form. The lifting mechanism is of sector type, and the rotary mechanism is of screw type. The balancing mechanism is hydropneumatic. Suspension – torsion bar. Metal wheels of automobile type GAZ-AA (disc), with bullet-resistant tires, filled with spongy rubber. The mass of the new gun in the firing position was 876 kg, that is, 270 kg more than that of the rival – the 76-mm regimental gun of the 1943 model, and at the same time, 324 kg less than that of the 76-mm ZIS-3 divisional gun.
At the end of the war, when work on this gun was completed, it no longer passed as a regimental gun according to the requirements, but could well be used as a light anti-tank gun. After passing factory tests, in September 1946, a prototype of the 76-mm regimental gun M-27 was sent to Leningrad to the artillery scientific testing ground. According to the conclusion of the commission dated January 31, 1947, the M-27 cannon did not stand the range tests. Its revision was found inappropriate. At this time in the USSR, work was already in full swing on promising recoilless guns intended as light anti-tank guns, so the M-27 gun was not in demand.