Gunsmoke is a solid outing for Murphy. He moved well in a Western setting and he practiced quick drawing to the point where he could do it faster than his instructor. Therefore, no fancy editing was needed when he used his gun.
The scenery alone makes this movie worth watching as Reb Kittridge, played by Murphy, goes from outlaw to cattle ranch owner and drives the herd to market to sell them in time so the mortgage on the Montana ranch can be paid.
Charles Drake, a regular in Murphy movies, gives a solid performance as well, and Susan Cabot is a little sparkplug as she resists Kittridge's advances (but only for a while).
The ending is suspenseful as you don't know until the very end who is loyal to who. Very recommendable.