The drozd is rated at 541 FPS. there is not much that you can do to improve it because it's a BB gun and the Co2 will only push the BB so fast. With a pellet gun you can select a lighter pellet to make it faster or a heaver pellet to make it hit harder. BB's all weigh about the same so you don't have much choice.
However you can put your BB's in a can and drop a few drops of Crosman pellgun oil in with them and roll them around in the oil to coat the BB's with oil. Also put a few drops of oil down the barrel this will make the BB's fire faster down the barrel. DO NOT SOAK the BB's it will gum up the gun with too much oil
The IZH Drozd is a full auto BB gun.
A BB gun would be more powerful
In the truest sense of the definition of "automatic", no a bb gun cannot be automatic. In function, however, a BB gun can be automatic. A good example would be the Drozd BB gun which fires full automatic, but used CO2 as the power source.
The 17 pound gun was more powerful than the 90mm gun.
If you are asking strictly about BB guns and not rifles, pellet guns or pellet rifles then I would have to say it most likely is the "IZH-Baikal Drozd BB Gun." It fires at a rate of 541 feet per second. It will fire 1, 3 or 6 shot burst at the pull of the trigger. However Pellet guns and Pellet Rifles are more powerful.
Other than a toy gun or water gun, the next most powerful one a citizen can have without a permit is a "B.B. gun".
Search the web for air gun repair or air gun tuning. There are several shops that tune or modify air guns.
All BB guns are alot less in (Strong) than Pellet guns. BB guns are luckey if they can attain 600 FPS (feet Per Second) Pellet guns & rifles can attain 1450 FPS. The fastest and most powerful BB gun I know of is the IZH Baikal Drozd that fires at 541 FPS. The Evanix AR6 Pellet rifles fires at 1450 FPS.
Yes. Many companies make powerful batteries. Li-Po gives your gun the fastest rate of fire and is a lot smaller. If you are going to have a more powerful battery, you should see if you need to upgrade the motor and or put some metal gears so they don't strip out as fast as plastic.
Removing the Air restrictor in a Nerf/Buzzbee gun increses the amount of air force able to use to push out the dart further and therefore make the gun more powerful.
Yes.
It depends on a couple of factors, but generally speaking, a gun.