Yep, you have a point, the barrel of the main gun is a little bit to long and to thick. Any idea? What lego-part could be a better equivalent? Maybe a hose?

Loads of different angles packed into a small MOC is impressive work! The turret is good and the front end is nice work too, especially the lights and bumper (fender). Having Googled the original, I think that you've done an excellent job of getting the shape right at mini-fig scale. My only criticism would be that the gun looks a bit big, both for the MOC and compared to photos.

Thanks! Any hint for the tires?

Perfect! I like the use of jumper plates in the turret!

This is awesome, great use of pieces.

Very realistic panzer.. Nice design