Kent - After reading the links I have two thoughts....
1) 50 Yards?!?!? My Sister can shoot at 50 yards - with ANY long gun, that is not a measure of true "accuracy". I frequently shoot 50 yards outdoors with my 1911's at a 10 steel "gong" and ring it out....
2) That guy in the review is shooting handloads. I didn't read enough to see if he was shooting fire formed brass, but still, it's easy to handload better ammo than you can buy "off the shelf".
I don't know if this production rifle can shoot, or not, so you are kind of venturing into dark territory.
I can tell you this, using a 20" barrel to shoot 50 yards is like nailing a porn star - it's a sure thing & anyone can do it.
Good luck with whatever you decide, but I would definitely price shop the FN versus a "Standard" .308 AR.