You'll need to be in the game to get started!;
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So in your inventory, if your weapon was number 1, you would press 1 and Space and the same time, simultaneously, many times.
 This may not work very well at first, but it takes lots of practice. It becomes quite easy, very soon.
Join a server.
Make sure you have a weapon that you sort of drag around, like AK-47, Flamethrower, Minigun, etc.

,
While walking (W, A, S, or D), click Space and take our you gun at the same time.
Keep trying.
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