Well, I might as well get in on this one...I'm saying it's pure FN Sporter Deluxe; no Browning involved.
I jacked up my monitor a bit (and applied my magic magnifying mouse), and it looks like it has the little barrel step right in front of the rear sight dovetail - which is the correct size and shape for a 3-leaf sight. Too bad the rear sight is missing, they're hard to find.
It also appears to have the 'ring of beads' in the checkering around the base of the pistol grip.
It has the 'pin release' floor plate; the bottom of the bolt knob is round, and it has the low left-side wing safety (which is my favorite of all safeties.)
They're excellent. I have several, and I'm very partial to them.