@MEAT GRINDER´s video: I have to veto! In the video below You see at least a pistol what is even smaller. I don´t know exactly if it is the same as STASI used during the east german periode but at least it is very similar to their bunch-of-keys-pistol. The agents were able to even cross the inner german border with that.
I think the video shows a T-Shirt wouldn´t protect You but maybe a jacket? But at least the shells of the STASI-mini-guns were poisend so a slight scratch of the skin was enough to finish You finally. I think it not too difficult to find a skin region where the bullet could scratch You.