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Check the other grenade discussions. There have been many plans and ideas, but few cheap or effective solutions.
When I looked into the ideas, I read a lot and then simply gave up. Not that rich or patient enough to make something that requires so many safety rules.
The best ideas are either illegal to use in many areas because of the propellant, or too expensive/fragile to leave as mines (or toss), or useless due to lack of power.
I agree with mcguyver; for now grenades are more expensive than they are worth.
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