Crawling into the edge of shelves while holding a gun allows you to teleport to a fresh spawn location with all of your items. (This could be used to escape PVP and or fast travel around the map to a random POI)
To do this you need to be in first person with a gun equipped, then you want to look up and crawl into the bottom row of a shelf till your character clips, then leave and re-join the server.
(Gun will appear to be jumping when in the right position)
if done correctly you should be at a fresh spawn location with all of your items.