45 mm anti-tank gun M1932 (19-K)

45 mm anti-tank gun model 1932 (19-K)
45 mm anti-tank gun M1932, displayed in Finnish Tank Museum in Parola.
Type	Anti-tank gun
Place of origin	USSR
Production history
Produced	1934–1937
No. built	21564+
Variants	20-K tank gun 21-K AA gun
Specifications
Weight	Horse drawn: 450 kg (990 lb) Motor: 510 kg (1,120 lb)
Length	6.4 m (21 ft 0 in)
Barrel length	2.07 m (6 ft 9 in) 46 calibers
Shell	Fixed QF 45 x 310mm R
Shell weight	1.43 kilograms (3.2 lb)
Caliber	45 mm (1.8 in)
Breech	Vertical sliding wedge
Recoil	Hydro-spring
Carriage	Split-trail
Elevation	-8° to 25°
Traverse	60°
Rate of fire	15 rpm
Muzzle velocity	760 m/s (2,500 ft/s) AP
Maximum firing range	4.4 km (2.7 mi)

The 45 mm anti-tank gun model 1932 (factory designation 19-K and GRAU index 52-P-243A) was a light quick-firing anti-tank gun used in the interwar period and in the first stage of the German-Soviet War. It was created by which was located in now Korolyov city, under leadership of engineer .

The gun bearing factory designation 19-K (Cyrillic 19-К) was a combination of a modified carriage of the 37 mm anti-tank gun model 1931 (built according to a documentation bought from Rheinmetall) with a 45 mm barrel designed in March 1932. and adopted by Red Army 23 March 1932. The reason for selecting 45 mm caliber was the large reserves of the French 47 mm shells which can be converted to 45 mm by milling out the driving bands. The resulting light quarter-automatic anti-tank gun was discovered to be unsatisfactory due low mobility and reliability problems, and after a series of modifications (including arrest of chief designer 10 August 1933 after several production defects were uncovered), was re-sent to army trials 26 December 1933. The resulted semi-automatic improved version was known as "45 mm anti-tank gun M1934" (Russian: 45-мм противотанковая пушка образца 1934 года). These guns were deemed obsolete in 1937 and were replaced by 45 mm anti-tank gun M1937 (53-K). The tank gun modification Russian: 45-мм танковая пушка образца 1932/38 годов (20-К) was still in use in the first stage of the German-Soviet War. M1932 guns captured by the Germans were given the designation 4.5 cm Pak 184(r).

The gun carriage was upgraded from wooden wheels to automobile GAZ-A pneumatic wheels in 1934, and sponge tires were used since 1936, raising total gun weight to 560 kg. The evolution from the 19-K to 53-K gun was rather gradual, with improvements incorporated in production lines several times.