Any sources that can confirm that vkstg was absouletly atcocious rifle, absouletly horrible when it came to reliability, simplicity of operation, ruggedness and accuracy when compared to other kurz rifles?
Well first the action which requires 6 springs for it to function and the receiver which was assembled from many smaller parts (actually has significantly more parts than an AR-15, twice that of a G3 or AK) held together by screws (big eyebrow raise) instead of a few monolithic ones, this does not bode well for anyone who's ever looked at a rifle and then there is the action which was to put it mildly not suited to rifle use, kurz or no. The number of individual parts in the mechanism also makes dissassembly and general usage a pain.
Then there is accuracy, 7 MOA was atrocious even for the day. There isn't much else to say.
This was a rifle designed to be handed out to a person whose long term life expectancy and time with the rifle was measured in weeks or even days. if he had to maintain or dissassemble it he'd exceeded expectations by miles. It was cheap and its parts could be manufactured by smaller shops, but it was not simple, ergonomic or even very practical.