Interbellum and WW2 period (1918-1945) experimental and small-known artillery

[lukasgrul]

Hello I found these blueprints while looking through German archives. First part is squeeze bore PAK guns on K18 wheel carriage. Then 128mm Panzerjagerkanone L/74 and then there is a 33300mm long barrel that I cannot identify.

 

[Andreas Epp]

and then there is a 33300mm long barrel that I cannot identify.

This is the barrel of a 21 cm K12E railway gun.

 

[lukasgrul]

This is the barrel of a 21 cm K12E railway gun.

I thought about it. But then I saw the rest of that folder and it did not make any sense to me why it would be next to blueprints of these PAK guns.

 

[lukasgrul]

Does anybody have any blueprints of 10,5 cm KWK L/70 or its ammo? I could only find these few blueprints.