Hi Jerry,
My Crosman 150.
The Benjamin 422 semi-auto is not nearly as well engineered or reliable as the Crosman 600, but in my opinion looks better and either works or it doesn't. The pellet feeding mechanism relies on three different size rubber O rings which inevitably wear resulting in multiple discharges. The Drulov Condor uses a similar pellet feeding method but replaces the rubber O rings with metal ones and works just fine.
Brian