Perfectly balanced with counterweights to reduce or eliminate recoil, vibration, or barrel whipping.
They are customizable, or it can be tuned to an individual shooter.
They aren't really practical for anything other than match use. Drop it and it's accuracy can be comprimized.
Here is site that sells them. Pretty pricy for a 22LR.
http://www.champchoice.com/store/Mai...yBody&c=FITAFE