4.2 cm Pak 41
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The 4.2 cm Pak 41 was a light anti-tank gun issued to German airborne units in World War II. This gun was externally similar to the 3.7 cm Pak 36, using a modified version of the latter's carriage, but used the squeeze bore principle to boost its... Wikipedia
Barrel length: 225 cm (89 in) bore (55.8 calibres)
Effective firing range: 800 m (2,600 ft)
Muzzle velocity: 1,500 m/s (4,900 ft/s)
Shell: Fixed QF 42×406mm R; Armor-piercing composite non–rigid (APCNR–T) Pzgr 41