While it is a pretty straight forward modification, you do need the proper equipment to get it right when you drill the new pivot pin hole for the sear lever. Ideally a milling machine is the preferred setup. A high quality drill press with indexing table could also be used. Trying to drill the hole by hand with a power drill or just in a vise with a drill press is going to lead to disaster.

So why would we be interested in installing an Improved Sear Lever? For the simple reason it gives us the ability to achieve a safe, reliable, lighter trigger pull below 5 pounds in conjunction with a trigger job on a Mark III Hi-Power. Without a trigger job it will typically reduce the factory trigger pull by about 2 to 2½ pounds.

What makes a Hi-Power a Mark III? Those pistols with the firing pin block system are Mark III’s and the Improved Sear Lever is specifically made for them. The Improved Sear Lever can be installed in a Mark II slide but requires altering in addition to removing the paddle and the slide needs to have additional machining done to allow the Improved Sear Lever to function properly.