Tuning Drozd blackbird fully tuned power and accuracy?

Those who have owned fully tuned 4000-5000 rpm and 1000 fps drozd blackbirds how accurate this drozd is say 20-50yards away? Is it must to have long barrel that you get those kind of power? How easy its to hit moving or flying targets 20-50 yards? How much you have to pay fully tuned drozd and is there shorter barrels option with power output 900 fps plus? I know the new sergey board gives 5000 rpm or more. How big of deal if you want to get it silenced? That 1000 fps you should get almost no sound with good supressor?

Is mooth barrel best option for those 4.5mm round balls or should it be rifled barrel? Can you get bigger diameter round ball ammunition drozds say 6mm? Mason dawson i know and sergey, but those who have owned the this funny gun give me somekind specs of its accuracy and how easy it hit moving and flying targets with it?

Top arsenal is one shop which have different kind of barrels and other equipment for drozd, but how long barrel you should put in to it? Do you get those power levels only longer barrels?

What i have understand that these things run 1600 psi. Theres no new videos about fully tuned drozd accurazy testing and other things? Only those 5 years and plus old videos!

Thank you in advance for the answers!!!