Smith & Wesson Shield Optics Ready Slide Assembly, SHIELD SMS and Holosun 507K Footprint, White 3 Dot Sights, Fits 9MM 3.1 Barrel Shield and Shield M2.0 Models, Armornite Finish, Black 3015613 With the rise in popularity of pistol mounted red dots" these Smith & Wesson drop in optic ready slides will turn the widely popular M&P Shield into your new favorite pistol. Featuring and Armornite finish with the classic white 3-dot iron sites" these slides feature a SHIELD SMS and Holosun 507k footprint. This drop in slide is compatible with the M&P 9mm Shield and Shield Plus with 3.1" barrels and utilizes your current barrel.