One thing the FLGR did was to give us the various firing pin block gadgets with all their problems.
A standard 1911 is almost impossible to make fire by dropping or driving it on the muzzle. The reason is that the slide moves backward, cushioning the blow so the firing pin inertia is absorbed and the firing pin won't creep forward and fire the gun. (The California tests are not real world - they are rigged to ban as many guns as possible.)
Those who have an interest in WWII pistols might have noticed that the Polish Radom has a two piece guide rod. The original design was for a one piece FLGR. But in testing, they found that the gun would fire if dropped on the muzzle, so they made the guide rod two piece to absorb the impact and prevent accidental firing.