This is one of Stewart's lesser known movies, but it deserves to be better known. Stewart plays an imprisoned felon who got caught while doing a little moonshining, and killed a federal officer in the process. Now in prison, he has nothing to do but think about guns and how to design and build a better one.

One of the most memorable scenes is when the warden confines him to solitary for an infraction. Stewart lasts longer than any other man without breaking, and when he gets out, the warden asks Stewart how he did it. Stewart explains that he imagined the walls of his cell covered with all the guns he knew and loved, and he just lay there, taking them apart and putting them back together again. The warden finds this astonishing and incredible, but nevertheless, Stewart managed to beat the warden at his own game.

Eventually, Stewart and the warden make their peace and when Stewart gets an idea for a new gun with a "...bolt that only moves 1/30th of an inch..." the warden, equally incredulous that such a gun could be designed and built, allows Stewart to work on it at the prison machine shop. When he completes the gun, the warden allows him to test fire it in a demonstration, becoming the only prisoner to ever fire a live weapon in the prison. The gun is a success and was eventually adopted by the U.S. military.

Although as I said, one of his lesser known movies, it's still one of the best and should be better known, and available on DVD. It's worth renting, especially if you're a Stewart fan if you can find a rental place that carries it.