Within one of several arms factories that the von Zehntners own, a group of engineers were working together to come up with a functional prototype for one of several designs which Bruno had given them.
His first drafts were crude and needed much work to perfect if they were to ever be adopted into service. But they were detailed, and accurate enough to create a functional prototype off of. Even if the weapons platforms operated via means that were well beyond the current era.
The first of the three small arms that were chosen to be manufactured into a crude prototype was the easiest of the three to manufacture. Which was the Gewehr 43 auto-loading rifle. The weapon would undergo a new destination in this alternate timeline when it was adopted.