This is a modern version of the well respected Model 29 in .44 Mag, but in stainless, the M629. It is a lighter weight version and is not the most pleasant to shoot for too long! It also has the dreaded lock - a contentious feature both politically and practically.
The Crimson Trace grips are useful for fast shooting but the downside is they are not too comfortable. For that a set of Hogues would improve matters. Overall though a nice package.
It was sold quite some time ago as it is rather brutal to shoot, the CT grips being sold on separately.
Gobango.net web site - see this picture and many more, plus articles.