The easiest thing to do would be to remove a few thousands off the top of your existing front sight.
However before you do that be advised that pistol sights should be regulated at 25 yards.
Here's a formula for regulating pistol sights.
Figure the difference in inches between your point of aim and point of impact, multiply this number times your sight radius, take this number and divide by 900, this will give you the amount of thousands of an inch the front sight will need corrected.
Best Regards
Bob Hunter
www.huntercustoms.com