Watch Six Gun Mesa for Free: How to Stream the Movie Online at 123Movies. . To get the herd on Six Gun Mesa, Carson has the owner and hands killed. But one hand, Dave Emmett was in town instead of with the cattle. So Carter kills a man and frames Dave for the murder. Johnny Mack Brown arrives just in time to stop the lynching and sets out to find the real killer. Getting the Doctor who falsified the murder evidence drunk gets him the information he wants and this leads to the showdown with Carson.