That's a GREAT price on a .22 Mark III.
These are one of the finest .22LR DA revolvers ever made, and are one of the best platforms to learn double action shooting with.
The massive frame and cylinder offer a steady hold, and the heavy cylinder tends to rotate to the next chamber easily once started.
Accuracy is almost always excellent, and the gun itself was a step above competitors guns in quality, fit, and finish.
The only "watch-out" is to NOT dry fire the Mark III guns, .22LR or center fire.
There is a possibility that the firing pin "might" break, and this is a factory repair ONLY.
Other than that, the Trooper Mark III is an absolute TANK, and if any .22 pistol was ever over built, this is it.