Full length guide rods are not necessary. They're only used because it looks prettier when the slide is racked back, and it adds one more thing to the list of mods done to the gun. i.e.
Kimber Custom II:
- Alumagrips
- Wilson bulletproof slidestop
- Wilson extra wide super duper thumb safety
- super duper power extractor
- hardchrome finish
- guide rod that doesn't do anything but look cool
- 18 novak mags, 12 chip mccormick mags, 200 stock colt mags with ISMI springs... etc etc...
But hey,I have a FLGR in one of my 1911s cuz yeah, it does look cool. And it changes the process to take apart each 1911 so it doesn't get redundant. And its fun to see how far I can shoot the plug. Other than that, I dont use that gun for defense, so no point changing it out to the GI rod and plug.
The GI plug is also advantageous since you can rack the slide by depressing the recoil plug if one of your hands were disabled in a gunfight etc...
etc etc etc..... save your money etc etc etc....