I read somewhere that Hollywood had two 1876 Winchesters rebuilt for this movie . With all the talent and money that was at their fingertips there is no doubt they could have put any sight on the rifles that they wanted . My guess is that they thought that most folks would never know that this was not an original set-up . I did like the movie , one of my favorite parts was when Tom shot the horse thief at Browns Hole in the toe . I have shot a lot of critters with a 76 and can tell you that dude would have been dancing a jig for sure . Need a tractor to carry a 76 rifle , now that's silly , eat some beans man Cowboy Up !!! ,,,,,DT