1911??

One piece? Don't you mean regular vs full length?

All the guide rods are one piece. Well, Ok the one in my 1911 is two pieces riveted together to make it one rather solid piece. But I don't think that counts as two pieces.
 
PROs:
-every 1911 gun that I've used a FLGR in, I note a reduction in muzzle flip and a reduction in time to reaquire my sight
-the extra weight in the front of the gun does a faster target recovery, reduce a bit of recoil
-improve reliability and increased spring life (maybe, but I'm not sure about this)
-also pistols were smoother to hand cycle after installation of a full length guiderod

CONs: none
 
I plan on changing out my full length guide rod for a two piece on my Kimber... I find it easier to manipulate with the GI rod... As for functionality, I have absolutely no clue on which is better...
 
I think Wolfstrack hit the nail on the head. The slight extra mass at the muzzle end will slightly ease the muzzle lift. For many I doubt it's in any way an issue. But for those shooting in matches it might just allow the shooter to move on to the next level of performance.

Some may also suggest that a full length rod makes it easier on the recoil spring since it doesn't need to click the coils past the end of the shorter guide. But if the end is suitably rounded this is certainly a very minimal issue. But again, on a match shooting gun where the spring is being finely tuned to allow the slide to cycle with just the right amount of travel controlled by the spring any slight additional smoothness may well be worth persuing. But mostly I think it's the added weight that provides some advantage.
 
I've read about that as well. I know there's a special full length guide rod that has a catch that can be activated while the gun is in slide lock to contain the spring under compression and it allows for easy disassembly.
 
I know the gun was designed without it, but every spring deserves a guide rod. Accuracy and reliability are all about consistancy, and a guide rod ensures the spring stacks up the same way every time.
 
But the extended front tube and short guide do a nice job of that on a regular 1911 setup.

And that reminds me. I've rounded the end of the guide rod to help the coils ramp up onto the rod but I never thought to profile the mouth of the guide tube to a venturi like shape to do the same funtion for the tube.
 
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