There are those who will point out that a FLGR will interfere with doing a press check.
Not only that, but clearing a round that won't chamber. I used to set my OAL based on the hood of the barrel, that is the cartridge OAL was exactly to the hood when a cartridge was in the chamber.
Exactly to the hood only works in the one 1911 that OAL is correct for. Found that out when shooting my reloads in a Kimber Clackamus. Rounds that fed fine in my Colts were too long for the Kimber. What happened was the Kimber slide was almost in battery. And the Kimber had jammed those over length cases into its throat. The round was jammed in so hard I could not rack the slide by hand. And because the slide was not fully in battery, and I could not make it go into battery, I could not shoot that round out. And to make things more fun, the Kimber had a FLGR. To clear a jammed round, I would hang the muzzle over the edge of the table, and have the recoil spring plug just on the edge of the table. Then I could push down on the handle, and that always extracted the jammed round. That does not work with a FLGR.
I ended up having to press the sights of the Kimber on the table edge to clear the round. I did not like doing that, there is not enough of a ledge, and it messes up with the sights.
That was the last I used a FLGR. It does nothing in terms of accuracy, and it takes away one method of clearing a jam.
The FLGR is just another example of snake oil salesmanship. Useless devices promoted as the next great thing, and they make someone a lot of profit as long as the hoopla lasts.
The more 1911's I buy, the more I find, I have to set my bullets deeper and deeper. A little deeper is not a function nor extractor problem, to date. The firing pin has plenty of reach, and the rounds extract.