Doc,
That's not the best picture. The Trooper has the Custer Battlefield/Gunslinger finish. It also has mismatched serial numbers to replicate those Colts that were sent back to the factory to get their barrels cut and often were returned without their original backstraps and triggerguards. If the idea of "mismatched" parts is not appealing, any of the Inspector series can be made with a 5 1/2" barrel with the antique finish.
Banjoman