Depending on the age of it, it could be all of them that LEE said. All of them are good shooters for the most part. Because of what looks like the longer barrel though, I will guess it is a Black Diamond XR. Most of the older named ones had a 22 or 24 inch barrel that hardly extended much past the forearm. The Black Diamond XR on the other hand has a 28 inch barrel and that looks about as long as my black diamond xr.