75 mm Reșița Model 1943

Reșița 75 mm anti-tank gun
DT-UDR 26 displayed in Timișoara.
Type	anti-tank gun
Place of origin	Romania
Service history
In service	1943—45?
Used by	Romania
Wars	World War II
Production history
Designed	1942—43
Manufacturer	Uzinele și Domeniile Reșița, Astra, Concordia
Produced	1944—45?
No. built	342+
Specifications
Weight	1,430 kilograms (3,150 lb)
Length	5.45 metres (17.9 ft)
Barrel length	2.501 metres (98.5 in) (rifling)
Width	1.82 metres (6.0 ft)
Height	1.55 metres (5.1 ft)
Crew	7
Shell	fixed
Shell weight	6.6 kilograms (15 lb) (AP)
Caliber	75 millimetres (3.0 in)
Breech	vertical sliding block
Carriage	split trail
Elevation	-7° to +35°
Traverse	70°
Rate of fire	up to 20 rounds per minute
Muzzle velocity	1,030 metres per second (3,400 ft/s)
Maximum firing range	12,000 metres (13,000 yd) (HE)

The 75 mm Reșița Model 1943 was an anti-tank gun produced by Romania during World War II. It combined features from the Soviet ZiS-3 field\anti-tank gun, the German PaK 40 and the Romanian 75 mm Vickers/Reșița Model 1936 anti-aircraft gun. It saw service against both the Soviets during the Jassy-Kishniev Offensive and against the Germans during the Budapest Offensive and subsequent operations to clear Austria and Czechoslovakia.

Development began in 1942 of a dual-purpose field and anti-tank gun that could be built in Romania to replace the collection of obsolescent field guns currently used and upgrade their anti-tank defenses of the army. To speed development Colonel Valerian Nestorescu suggested combining the best features from the 75 millimetres (3.0 in) guns already in service in Romania, Germany or captured from the Soviets. Colonel Nestorescu was selected to produce a prototype to be built at the Uzinele şi Domeniile Reşiţa in Reşiţa. Three prototypes were built combining various features and trialled against the ZiS-3, a Reşiţa-built copy of the ZiS-3, the Pak 40 and the Schneider-Putilov Model 1902/36 field gun in September 1943 and the third prototype had the greatest armor penetration. It was adopted as the Tunul antitanc DT-UDR 26, cal. 75 mm, md. 1943, commonly shortened to 75 mm Reşiţa Model 1943.

It combined the muzzle brake, recoil and firing mechanisms and split-trail carriage of the ZiS-3, the barrel, rifling and cartridge chamber of the Vickers/Reşiţa Model 1936 anti-aircraft gun and the projectile chamber of the Pak 40. It had a gun shield that consisted of two 6 millimetres (0.24 in) plates separated by a 20 millimetres (0.79 in) gap. It had only 680 parts, almost as few as the 610 of the ZiS-3, but far fewer than the 1200 of the Pak 40. It had a higher muzzle velocity and thus greater penetrative power than the Pak 40. It therefore combined virtues of both the ZiS-3 and Pak 40. 1100 were ordered on 10 December 1943 from Uzinele și Domeniile Reșița, Astra in Braşov and Concordia in Ploieşti.