One the leading maker pyro products that can be used in airsoft, TLSFx,  have one of their 3rd gen pyros in a video from the airsoft grenadier... "The M10 Ball Grenade from TLSFx is part of their superb 3rd Generation range of pyrotechnics which are designed to accurately reflect real world devices. These products are more expensive but provide a far better experience for MilSim airsofters or anyone who appreciates the realism of the 3rd Gen range.

It's the usual 5 metre blast radius that's quoted by TLSFx but i found the grenades i used in filming this video to be far more powerful than expected with debris spreading out much further and the 'Hits' being more forceful. I was very impressed by these grenades which retail for £10 each in the U.K. Please check directly with TLSFx for any enquiry regarding worldwide availability."