S-Thunder just released their latest product, the S-Thunder Foam Ball 40mm Grenades which is available in either short or long versions. You can put the Foam Ball which you will have to purchase separately and use them as ammo for these grenades. They also have a stand-alone 40mm grenade launcher, which I can say looks a sweet thing to use though I hope these will be useable for existing airsoft grenade launchers mounted on the AEGs and Blowback rifles. Pricing and availability not mentioned, but you can watch the video below.

S-Thunder short CO2 foam ball grenade

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S-Thunder long CO2 foam ball grenade

S-Thunder foam ball package

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