Sorry, I just forget to come back to this question.
I think it can be legally imported as it is a dummy only model, similar to the dummy models by SHOEI.
It is not a deactivated real firearm and thus legal in Germany or the UK. The problem is that it is so realistic, being full metal (aluminum) and using a lot of real parts like hand guards, magazines, sights etc. So it won't be easy for customs to realize what it really is, a sophisticated toy model gun, which could cause trouble.