Matrix Aluminum Green Gas Powered Airsoft 40mm Grenade Shell
(Capacity: 60 Rounds)

"Pros:
-Purchased 5, all 5 work great.
-Machining is beautiful.
-Solid grenade shells, feel nice in the hand.

Cons:
-Reset is tiny bit finicky. Would be hard to do under fire, but off the field it is just a few seconds of wiggling your key.

Other:
-Actually triggering them requires the 'primer' to move a bit further than usual. Depending on your launcher you may need to enhance the 'firing pin' with a bit of tape to extend how far it pushes. In my case, the Matrix M203 plastic "Speed" version, 3 layers of electrical tape squares and they fire wonderfully.

"Great shell, holds lots of gas and lots of bb, does it's job.
Looks intimidating. Recommended.

"Very good quality grenades. I've owned 16 and they are a spectacle on the field.

I've had issues with three, one being entirely inoperable as of my last game (o-ring malfunction on the mechanism that holds the ball bearings, it seems to have shrunk and doesn't fit snug in the shell's head resulting in a leak). The other two required some work with the bottom casing and are currently working fine (originally hard to fire off when filled with gas, took some sandpaper and a lathe to the inner housing to correct the issue).