My only question about FLGR is, why do some gunsmiths use them for their 1911's?
Don't know the answer to that one. Aesthetics? Because it's expected?
The FLGR is inert. It doesn't move, and it doesn't do anything that the standard length guide rod doesn't do just as well. It neither enhances nor degrades the accuracy or reliability of a 1911 pistol, other than making field-stripping a little more trouble.
So, it again raises the question:
"What is it for?"
The only answer that I can come up with is: