Take pin all the way out. The blade is then a force-fit and can be wiggled out. Call Ruger and order the tallest front sight blade they make. Don't take their "We only have one height front sight. They are all the same" baloney. You want to speak to a gunsmith.
Order Ruger part MR0311, High Front Sight Blade .445", and also part KE-26, Ft. Sight Roll Cross Pin.
This taller blade allows the Buffalo Bore Heavy .45 Colt loads to shoot to point of aim, instead of 8" high with the old sight blade.