So, "AR" stands for "Aquatic Rifle" now? ;-)
Seriously, the FAL can be trimmed down to a more manageable barrel length. And it possesses some attributes that might be a stretch for any AR variant.
The Tale of Ol' Dirty. A Texas Legend (Update: over 16,000 rounds fired w/o cleaning)
The FAL was designed by a guy whose name I cannot spell and probably couldn’t pronounce. He has a pretty good pedigree tho.
He worked with John Browning for several years perfecting the Browning Hi-Power.