If the Remington has a Bradley sight just grip the side flats with a safe pair of pliers and give it a half turn counterclockwise..from that point on it should be a finger removal. Now..unless Remington has gotten into a regular 6X48 thread, i hope the replacement sight has an adapter for their thread(some bastardized 48 thread). If not you can cut the remington with a 6 X48 tap...it is just a little larger than the regular Remington.. then you thread the new sight into place. If it doesn't end up straight you will have to(carefully) file the bottem of the threaded portion of the new sight and try again until it ends up straight.. Use a little locktite and tighten it in.. Check threads before you do anything. They may have changed them on the guns.
Personally I wouldn't change the darn thing. If you see the front sight when shooting at a bird or whatever...you ain't lookin at what ya should be...The target. If your face is on the gun...You'll be looking down the bbl...Just look at the target
These new sights are really neat...they make your eye go right to the end of the gun....Duuuuuh! At least mine does that.