This one was adopted from the maingun of WWII German Admiral-Hipper-Klasse heavy crusier. It was used as a railgun or transported on road with 6-axle vehicle. Most of them were in Atlantic wall.
Manufacture: Kurpp
production: 8
weight: 86.1tons
Length: 19.445m
Barrel length: 11.587m
caliber: 20.3cm
elevation: +10¢X to +47¢X
fire rate: 2 round per minute
muzzle velocity: 925 m/s
Fire range: 37 km
Quoting P. Voranc
This is great! You really should have put your stuff into more groups, because you are a remarkable builder, with an excellent part usage ability.