The pearce grip frame insert fits in the bottom rear cavity of a glock gen-4 mid & full size utilizing a friction fit to secure it in the frame.It helps keep debris out of the magazine well.Fits model m17 18 19 22 23 24 31 32 34 35 37 38 44 and 45.This product will only fit generation 4 and 5 frames.Allows for use of factory interchangeable backstraps.(will not fit 20 21 40 and 41 models).Fits on the new glock m44Type: Grip Frame InsertFirearm Type: Grip Frame InsertMaterial: PolymerFinish: BlackAdjustment Type: No