12.8 cm Pak 44
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The 12.8 cm Pak 44 is a German anti-tank gun used during World War II. It was designed as a result of experiences on the Eastern front in 1943. The German Army came upon the Soviet 122 mm field guns and issued a requirement for a similar weapon. Wikipedia
Shell: Semi-fixed 128x869mmR
Barrel length: 7.02 m (23 ft 0 in) bore (55 calibres)
Breech: semi-automatic horizontal sliding-block
Caliber: 128 millimetres (5.0 in)
Carriage: cruciform (some were split trail)
Designed: 1943
In service: 1944—1945