Hi Elang, the hardest parts to model on the Beretta are the pistol grips and the front of the slide where the barrel shroud terminates.

The gradient from KeyShot seems to be when rendering to 8/16bit formats such as jpg if you step to 24/32 bit formats such as png, tiff, jpg2000 etc then the 'banding' is mostly eradicated.

Martin
(TpwUK)