if you are looking for other(cheaper) options... I've installed front and rear sights by doing nothing more than applying masking tape to the sides of the slide, clamping it in a good vise with protecting aluminum vise jaws (a couple of pieces of aluminum angle works) and tapping the base of the sight with a brass or aluminum drift...if a new sight does not start easily into a dove tail, laying a good bastard file flat, and making a couple of passes of the base over the file will lower the sight somewhat, but effectively narrow the width of the sight base...excessive light under a sight can be eliminated with a drop of wicking loctite...
to lower(raise bullet impact) a fixed front sight on an auto with a fixed rear sight, a good bastard file with a piece of flat plastic, formica, or brass glued on the rear 1/3 of the file does two things... resting this protected part on the rear sight, allows the top of the front sight to be cut parallel with the rear sight blade, and at a slight forward angle to keep light from reflecting off the front sight blade.... go easy as all it takes is 10 to 15 thousandths to change point of impact 1" at 25yd on 1911 pistols ... measure the distance to the top of the sights... it is easier to measure from the bottom of the slide... zero the calipers to the height of the slide by itself, and then the top of the sight
windage movement is accomplished in a similar manner with a caliper... a piece of machined metal clamped to the side of the slide is a good reference point to locate your caliper on to measure the amount of drift you apply