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The rubber plug is in right? Assuming so or you would have gotten instantaneous detonation with every pull.
What the temp of the room you're in? Average 20deg C? We've been in indoor CQB places where it's so hot that the grenades essentially cook off instantaneously using propane.
Add a bit more lube. (you don't need bbs to test this)
- with the grenade reset (i.e. push the timer in with the key thingy), base cap off
- put 2-3 drops of grenade oil (this is 10wt silicone oil...not the 1-1.5wt GBB oil) on the edge of the shuttle (where the shuttle seals with the body), turn/tilt it around so the oil flows and seeps in around the shuttle. Use the key to push the shuttle in (like it was going to fire) and reset again. Add another drop of oil to the seal and move it around...work the shuttle back and forth a couple of times. It should move nicely and not sticky. If it's moving loosely (i.e. no resistance)...there's an issue.
- place pin in 3sec position, make sure the rubber stopper is inserted
- put one drop of grenade oil on the fill valve nipple.
- invert your gas can (can is upside down so liquid propane is going into grenade) and fill for a good 3-4 seconds.
- replace bottom cap securely
Pull pin and count...should be a good 3 sec in at normal room temp. Should be even longer since the propane fill you just did made everything cold(er). If it detonates "normally" (2-5 sec)...it's good...keep it lube up. If it goes off right away, try the same test (NO BBs) but keep your thumb over and pressing down on the rubber stopper. If that works your stopper might not be sealing well. If it doesn't, try to get a local guy who's used them to check it out and test it. If that doesn't work...contact AI and talk to one of the guys there.
NOTE: You don't even need to put the bottom cap on if you're just testing the timing...all the gas will just go out the bottom, which might be safer so you don't get a facefull of oil gas.
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