What type of hook do people use to hang the gun the the belt?
It is normally a S hook that is belt so that the top bend can ctach onto the belt’s ring.
what he said…sometimes if you use the Search, you can find a lot of ideas and pics,
Search results for '' - GBFans.com Look for it at the top right of the page.
for example, I typed in “hook gun to belt” and found 2 or 3 posts offhand..
Also when asking questions, the region forums like Europe should be used for things and events that apply specifically to Europe, like fan gatherings in Europe, otherwise for this one, you can just use the proton pack forum. 
Good luck.