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Long story short, BBs are loaded in the front of the shell and retained in their holes by Orings. Gas is injected into the bottom of the shell and is stored in a reservoir. When the contact on the back of the shell is pressed the gas inside the reservoir is released and pushes the BBs out of the shell.
Dimensions of grenades vary, they may all have the same diameter but there are all sorts of different lengths.
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"Its only a little bit on fire"
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