And, of course, I can't open Yon's website, thanks to Fox readers swarming it.
So, as of now, nothing to go with but this picture.

First thing that pops to mind is the XM47 US riot control grenade - which are roughly that size. They're made out of rubber, and have a blow-out hole in them. When you throw them (don't hold on too long!) the plug blows out and the gas expels in a jet, causing the grenade to skitter around, building your CS cloud faster than the standard grenade. I used them a lot on the HHB 35th DIVARTY when evaluating their annual training in the mid-late 80's.
You can see an excellent example of them here at InertOrd.net.
Whattaya you guys think?
Update: Another weapon that comes to mind is the warhead for a RAW (Rifleman's Assault Weapon) -type weapon.

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