It is a showstopper! I managed to find an original clip for it and I have a dozen rounds left! These are mostly, I believe, chinese blank rounds converted to live rounds with a CNC turned bullet made of solid brass.
I have yet to fire the rifle in semi-auto mode with the clip. We only fired it with single rounds loaded manually up to now... The cost of the ammunition makes firing a full 5 round clip a thing to do only on special occasions!
If I invest in a reloading setup for the 13mm t-gewehr, I may get the dies for the 14.5mm and have bullets made for it also... I'm beginning to find .50 bmg rifles and ammunion not that expensive after all!!