Andi, Very good content.
I forgot about the 7.5 joule limit while watching the review. At full power the Diana 54 Air King Pro is very impressive. I'm lucky to own two, one Beech stock (5.5mm) and one laminated (4.5mm). Great review and wonderful gun at any power level.
The "Pistolenkarabiner" videos really peak my interest, I haven't seen very many air pistols equipped with shoulder stocks, especially being beautifully laminated.
Looking foreword to future reviews. Take it easy and be safe.