Re: WW II Walther PP holster question.
Most of the German rifles "captured in hand to hand combat with Hermann Goering himself" were actually taken from stacks of guns taken from prisoners or from German depots by troops getting ready to return to the States. No American combat soldier could have hauled around his own rifle plus a captured rifle.
Enemy pistols were another matter as they could be tucked in a pack or duffle bag. But there was a downside. One commander prohibited his men from keeping German pistols; he complained that he had had more men wounded or killed from playing around with unfamiliar pistols than he had lost in combat!