A star trek redesign exercise.
The Warden class of starship was lighter armored and more heavily armed. It was produced in a limited run. The captains of this class of ship developed quite a reputation in the Federation and were often referred to as the gunslinger captains in reference to the particular strategies and brand of diplomacy the Warden class was best deployed under. This particular image is of the last ship of its class in service and which was referred to simply as "The Last Gunslinger"
Personal fan work.