Didn't want to machine my slide - Burris FastFire Reflex Red-Dot Sight Mounting Plates

Bought this mounting plate to install a Vortex venom on my Sig P226. The unit mounts in the rear sight dovetail. Simply to knock the rear sight out but REMEMBER to INSTALL a SCREW in the hole of the threaded burris plate when you drive the new little mount plate into the dovetail. If you don't do this, there is not enough meat around the screw hole and it is a tight fit, so you may deform the threaded hole by pounding on it. Fortunately I saw the tiny little note in the instructions and avoided this. The plate has four dowel pins that mate with the Burris or Venom and the sight mounts firm to the plate. I had to grind a bit off the screws that mount the plate to the threaded part in the sight slot. I have a stock P226 and this is a kit for that gun so I don't think I should have needed to do this. If you don't, the screws will bottom out before the plate is tight to the slide. So four stars for that. There is an additional hole if you want to drill and tap the slide for it up front, but I did not. 500 rounds so far and it is still tight. Blue lock tight was used. So far so good.