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have you tried an airsoft grenade? it’s just a mechanical, spring operated co2 cartridge piercer, enclosed in plastic. The plastic shell is expendable, and when it bursts it’s around 125db or so.
You can get the same effect popping a gallon milk carton
etc.
Did someone say train horn?
You can get the same effect popping a gallon milk carton
etc.
Did someone say train horn?