Phantom stock class
10 round magazine
12 gram adapter
May go off in you pocket or in pack
Atomic Ordinance Big Boy grenades are possibley the best around. For a mere 6 dollars you get 100% chance of these things working. There is nothing to pull,, all you have to do is put a decent arc on it when you throw and the Big Boy will go off. They are actually kind of like a water baloon in looks. They are filled as much as they can be and there so much pressure in the middle that it forces the rubber band off the top when it hits the ground. Once i was getting ready for a game and I had my grenade out about to put on the end of one of my 12 round tubes, but it rolled off the table before i was able to put it on and it went off on about a 3 foot drop. They have a pretty good blast radius as well.
Good blast radius, work 100 percent of the time, and are cheap.