Here is a very in-depth description on how to make a silencer, but really a sound suppressor for your paintball gun. If you want to try to make a suppressor for a real firearm, the principles are basically the same. So, for ninja-like paintball action, watch this video tutorial to see how to make a silencer for a paintball gun, or sound suppressor, whichever you would like to call it.
Keep in mind, making a silencer or suppressor for anything that fires a projectile is illegal without permission from the ATF (US Bureau of Alcohol, Tobacco and Firearms).
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