RUGER MARK I grips (net) screw as these frames tend to

as these frames tend to vary

These grips fit Sig Sauer Mosquito and GSG Firefly model

If your gun has the earlier (Pre-2017) frame with the beavertail that is curved upward and having the "keyhole" shaped mag release button these will fit your gun

The checkering is fine and sharp

These grips fit CZ (Ceska Zbrojovka) models 82 and 83

RUGER MARK I grips (net) screw as these frames tend toThese grips fit Ruger model Mark I, Standard and Mk I Target WITHOUT the A 100 frames (A 100 frames can use the Mk II grips). You should check your gun to ensure you DON'T have an A 100 frame as mark "Mk I" uppers are present on A 100 frames; you can do so by removing the left grip panel and looking for an "A 100" stamp on the area under the grip panel. These grips WILL NOT fit the A 100 frame, and you should select a Mk II grip set if you have an A