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NO.
If the smoke grenade operates on impact, then yes. However, it is a bad tactical idea, because if you have the desire to use a smoke grenade, then you are in the situation where you have enough time to pull one out.
An airsoft grenade does not explode, it launcher BB's out of the launcher powered by gas.
No. Most are only available online and are for use with grenade launchers.
ITS REALLY SIMPLE pull the pin
Simply refill them, yes.
Yes, but check before hand to make sure they can handle the pressure of Propane (they can if they can handle Green Gas or Top Gas)
Only use proper air soft or paintball cartridges with launchers like that.
It depends on the reason why they are
There is no safe way to make a grenade, even an Airsoft grenade can be dangerous if not made correctly, and making an explosive device is against Federal and Local laws. Better to get one that's already made.
I would not use propane. Green gas has a lubricant in it to help keep the unit running smothly
yes