!The following is 99% fiction! The J170 (first name) is a 170 mm anti-ship cannon first built in Finland during WW2 and was mainly used to counter highly armored enemy battleships, and it did it damn well. The reasoning behind the fact that it can aim up at this angle is a just in case you are able to get a shot at an airplane. After it did what it does best, the production of these stopped after 43, which of the majority were dismantled in 1975 for spare parts and recycled metals. Only a handful remained and were sold to other countries such as: Norway(6 bought in 1998), Sweden(8 bought in 1993) and Estonia(3 bought in 2001). Now they are currently undergoing modifications to fit in with us and are now renamed to Uputaja (means drowner in Estonian). All three are currently located at Tallinn for now but will be transported elsewhere in the near future.

Specifications:
Total lenght - 8.5m
Barrel length - 7.3m
Height - 2.6m (w/o the base plate)
Muzzle diameter 17cm
ROF - 106/min
Weight - 1597kg (w/o the base plate)
Rotation speed 3RPM

Added details:
(Almost everything is new from the last one.)
Added a muzzle brake which flashes when you shoot. Pretty neat.
My version of the Estonian navy flag.
The words n' stuff.
The thing at the back.
The whole thing except the barrel itself.

Decription of these alien words:
E.K.V stands for Eesti kaitsevägi (Estonian defense forces)
Merevägi means navy.
The more you know.

Controls:
VTOL - ups n' downs.
Roll - rotate (limitless 360 spin. A thank you to @Minecraftpoweer for teaching me a bit about gyroscopes in sp)
shoot - ... shoot.

Enjoy!