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You absolutely need those big black screw in covers that go onto the bottom of the grenade....they are the "safety" and without them all the propane will escape out the bottom and not push the BBs at all.
You must let the grenade "warm up"...best to let it return to room temp after firing before filling...and then after filling before using.
Lube 'em up. Can't say 100%...but I don't think that it's possible to use too much lube. 2-3 drops on the main cylinder...work the piston back and forth...oil in the gas....a drop of oil on the fill valve before you fill it.
If BBs are getting "stuck" in the channels (i.e. one side blows out completely and there's still BBs stuck in the other side)...consider taking the shell off (6 or 8 little screws hold the plastic shell onto the metal innards)...clean out the BB channel and reassemble. Lots of dirt and broken BBs will eventually trap a BB in them.
Good luck....buy more, it sucks to wait for them to warm up.
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