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Tutorial:
Have 2 people down beside each other
Double revive and keep switching till your gun disappears while your reviving
finish reviving and your gun should be missing
buy one off the wall

sorry if reposted but i couldn't find another video of it on youtube.

Nice find can't wait to try.

This works, nice find but it only works if you have two guns (doesn't work if you have 3 guns).
Edit: when you have 3 guns, can you upgrade one without lossing any of the others?