Is There Full Auto PCP or HPA Conversion BB Guns?

Looking for something new and fun for my little guys. How cool would it be for a 6 year old to master this carnival art everytime. Not pellets, BB. Thanks. 
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Thanks, I got in touch with them and the newest model is a pricey $780. The good thing, it's an HPA tank, not co2. $780 just seems $300 more than it should though.

As fun as it may be, I am not sure if its $780 fun. I'm still weighing it out. He is across the country, so if it does need a repair, shipping will be biatch every time. 

And, I dont think this is something I'd buy used even if I could find one. 
 
I really wanted bb full auto using an HPA tank but for almost $800 I think I will decide on a full auto pellet gun instead. The costs of Co2's and being able to shoot in the cold months will offset the costs of ammo somewhat. Also, pellets will be more accurate. And the price of these full auto replicas are about a quarter to a third of the Drozd. I might as well utilize the compressor I bought instead of tossing money away on Co2. Now I just need to decide which one. It's for a 7 and 9 year old so something compact with a high shot count, maybe over 30? Suggestions? 
 
I have a Crossman DPMS And the MP 40 by Umarex and Has the Crossman beat By far. It has a 50 round magazine in it and will go through three magazines before the CO2 runs out. It’s a replica just like the Umarex M1 A1. The M1 A1 is a nice replica but Only has a 30 round magazine.you get better performance out of the MP 40. I only paid $180 for mine because it was a refurbished one but look brand new when I got it. Mine works flawlessly and is a very close replica to the German MP 40. I know you would rather not go with CO2. I’d buy it in bulk and save a lot of money.