If you have a Gen3 Glock 19 and are looking to get top tier quality aftermarket parts for it, there are only a few places I'd recommend to look. First and foremost, you should have a Striker Control Device, aka "The Gadget" (Read my review), then if you are in the RDS camp, I'd highly recommend going with a Trijicon RMR
and a purpose built slide for the RMR from Thompson_Leh. If you want good suppressor height sights, please check out Ameriglo optic height sights
.