Can anyone tell me the benefits of having a full length guide rod instead of a standard GI short guide rod and if so is there a specific type that works best? My goal is to build a tactical side arm with more modern parts replacing original GI parts from the second world war. I bought a Wilson Guide rod and spring kit for a officers model witch I thought was the same length or size as a government model? The spring I bought though was about an inch and one half shorter than the current spring and more progressive and stiffer (if that describes it). I couldn't use the full length guide rod because the reciever needs to be milled to hold the bushing for the guide rod. I am starting to think I just bought one of my first lessons, and to go ahead and start the first of my spare part box. Anybody have any advise?