The .125 wide front with the .125 rear tightened the sight picture up closer to where it should have been from the start. When my department tested the M&P I told the S&W representative the sights had too much gap which allowed shots to wonder left and right when shooting rapid combat style. Of course his response was "our target shooters love them". Every gun I own that has a great sight picture for speed shooting has the front sight wider than the rear notch. I don't know what cause manufactures to move away from that. For shooting slow and taking the time to align up the sights the wide gap is fine.
Great product that was easy to install.