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We loaded up the UFC 40mm airsoft grenade shell with 120 rounds of 0.2g biodegradable BB's. Then we gassed it up with a propane can--grenade on top, propane tank on bottom--for about three seconds. We fired grenade shell between 25 to 45 degree angle, using our finger, without a grenade launcher. The cloud of BB's landed approximately 60 feet away. We suspect that you can adjust the distance of travel by changing BB weight, the number of BB's, and, of course, the angle of attack.
After triggering the grenade, it creates a nice bang sound. The grenade shell creates this sound whether it is filled with BB's or not. We have shot a video of the grenade making this sound. See below.