This is my RCA 400 model MI35002 projector that not only shows optical sound films but also mag striped films. It is also capable of recording on mag, striped film. Here I am showing how it`s threaded up and showing some clips of a mag reel of film showing a couple of scopitones that I bought off of Ebay. The clips of film were processed in technicolor, so they won`t fade and the colors are really nice.