Pearce Grips PG-G4MF Frame Insert for Mid and Full Size Glock Gen 4 Frames (NOT for 10mm or .45ACP)
Fits Gen 4 (only) models 17, 18, 19, 22, 23, 24, 31, 32, 34, 35, 37, and 38Allows you to use factory interchangeable backstrapsHelps keep debris out of the magazine wellFriction fit holds the unit in place in the bottom rear cavity of the frameMade in the USA