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i responded to your other post about using a tdod/tdoe relay. i now realize what your using it for and know it won't work (too big to incorporate). you could use a 555 timer and use a potentiometer to vary resistance to the timing circuit to control the timed output, but this would require a power supply, resistors, capacitors,etc. that would take up too much space for a realistic sized grenade. the reason why a real grenade works is obvious and without pyro as either a trigger or release means i don't see how it's possible to contain bb's, propellant, triggering device and release outlet in a casing style, size and type other than the airsoft grenades already manufactured. i'm not saying it can't be done, just may be more cost and labour intensive than it's worth.
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