AH! No!
Noone was supposed to see it yet, I've literally got one of these disassembled on my bench as I type. I'm in the middle of modifying it lol.
I was going to post it tonight after I've finished the mod.
Basically it's a Piston Valve system much like the Splitfire, Hornet, Blastfire, Lightning Blitz etc.
It's okayyyy, but it's still a Nerf type Grenade, so it's crap. The concept is sound though.
They weigh about 7 1/2 oz or 200grams (I weighed it just now while it's in pieces, this is without the foam wing pieces, restrictors or ammo)
-Tidge.
Ah, thought it uses the piston valve setup. It sounds like a hornet when it fires. By the way, sorry I ruined your surprise.