I just recieved the Jerry Kuhnhausen Video tape for the 1911 45acp and this is another must have for $19 if your going to play with, build, repair or just checkout your 1911. I find this instructional video easier to understand over the book its like a hands on. It explains all the "fits" and what to look for like the new barrel installations with the proper link length. If you ever installed a new barrel in your 45acp it may or may not be correct even though it shoots ok, while it shoots ok or just the feel isn't good enough by itself it still may not be correct.