I installed a Hogue Handall Jr. Grip Sleeve on the Shield. I did so to buffer the recoil pain resulting from the large quantities of ammunition I shoot during practice sessions.
It is difficult for me to focus both eyes on an iron blade front sight. The remedy I found is to install a fiber optic front sight. With it, my eyes immediately capture focus on the sight, I take aim and fire quickly on target. As a result, I have installed fiber optic front sights on all of my pistols and revolvers. The latest being on my M&P 40 Shield.
I have attached a photo of the Hogue Sleeve and the fiber optic front sight.
You will note that the sleeve has been installed reversely with the top on the bottom and the bottom on the top. I found my fingers better fit the sleeves finger protrusion this way.
My first range session with these modifications proved that I made the right choices. I had no focus problem and my hands were able to take the recoil shock of 250 rounds of 165gr FMJ without suffering pain.
Now, after shooting 650 total rounds without any gun failures, I have real confidence in the Shield as my gun for personal protection.