Pearce Grip Frame Insert Fits Glock Gen4 20/21/41 Black PG-FI21G4

This unit installs in the bottom rear cavity of the frame/grip, utilizing the lanyard hole for retention Type: Grip frame insert Compatible with Glock Gen4 20, 21, 41 Made of a high impact polymer, this insert is designed to keep out dust and debris as well as finish off the overall look of the frame Allows for use with or without of the factory interchangeable backstraps