This is a Pearce Grip Frame Insert, model PGFI20SF.
These units fit in the bottom rear cavity of a Glock M20 and M21 SHORT FRAME utilizing a friction fit to secure it to the frame. These grip frame inserts will not fit a Generation 4 frame nor a standard Glock M20 or M21 frame.
Features:
High Impact Polymer
Keeps Out Dust and Debris
Friction Fit
