Currently anyone who goes on CA.org should know what I'm talking about. Looks promising IMO.
YouTube - GBB AK firing rate
He has also more videos of the gun on youtube, just click on his name. They function on a similar system like Escort IIRC. Two things I should mention,
1. They run off of external air rigs,
2. You're looking about Systema price tag($900+USD).
If there was retailer bringing these in at a reasonable price I would be interested.