I have 2 FALs. One is an STG 58 which is basicaly a Austrian parts gun built by DSA. The other is a DSA build with the medium contour barrel. The medium contour barrel is worth every extra penny you pay for it, it puts the rifle within reach of MOA territory. This barrel is distinctly superior to the Austrian barrels. The STG 58 is a battle rifle, the medium contour DSA is a precision rifle, albeit one with all of the FAL battle rugged features. I can get not quite MOA groups at 100 meters (1.1"), but then it gets better at 200, and holds MOA accuracy out to 300 meters, and excellent battle accuracy past that. With a DSA built FAL with either the medium contour or the heavy barrel you own the real estate out to an honest 800 meters. There are precision rifles that will do better of course, but outside of the FNAR or the odd M1A, not one of them is a semi auto that can keep cranking rounds out till you run out of loaded mags.
My STG 58 is 1.7 MOA at 100 meters, and will hold close to that way out there, I have not fired it at more than 600, and probably will never have to(hopefully).
I have not had experience with FALs outside of those 2 but I am told that Imbel is good also, and the grail of the FALs is the FN build rifle, although I do not see how one could do much better than the DSA rifles.
Of course if you want a precision FAL you give up the flash suppression and the other mil type stuff hanging off the barrel end.