Oops, I was thinking of the FP series sights, but I did try the WGRS one too at one time. I think you could get away without the high front sight at 50 yds but maybe not at 25 yd. The way the sight is designed it curls down the back of the receiver a bit so you can get it lower as you move it back.
I can't remember which front sight I used with the WGRS.
I wasn't that happy with the WGRS as it is awkward to adjust unless you are going to fix it in one place and leave it.
Personally I don't like the firesights.
As far as Williams sights go I think the best would be the side mounted FP with target knobs as it has the best range of adjustment. I didn't go that route as I didn't want to drill and tap my early 1968 receiver.