Quoted:
The AR-10 would be my first choice...the FAL second and the M1A third...the HK91 is a great rifle in many ways but it is heavy #12 loaded...and has poor ergonomics, tough as a box of rocks though.
I have owned an HK91, M1As and FALs
my choice is the FAL
the accuracy is very good if you get a quality rifle like DSA
every thing else the others cant competet with an FAL
M1A is not easy to work on or mount optics w/o getting an expensive chassis that will make it weight a metric ton
The G3/HK91 is not easy to mount optics and if the stamped receiver gets bent it wont work, hard to work on also, complex bolt system
AR10 isnt bad but againnot as durable or reliable as an FAL
get an FAL
most people who say G3/HK or M1A or AR10 never had an FAL or had a crappy FAL
just because they have the other rifle they will talk like experts but dont have experience with the FAL- happens a lot here
make your decision based on thos with experience
Hands down...THE FAL IS THE BEST BATTLE RIFLE of the ones stated above (G3/AR10 deferred/M1A). The SCAR may be better but I dont have much experience with them