The German 5 cm gun, as used in the Panzer III was later widely used in many field fortifications. You could find them on all locations, France, Netherlands, Belgium.
5cm gun position with Munitionspanzer I |
5 cm kwk Bunker with Panzer I |
Atlantic wall in 1/144 |
The Bunker with the 5 cm kwk gun can be bought in my Shapeways shop: Bunker