Frame Insert for GLOCK GEN 4 29/30. Fits fourth generation model 29 and 30. This unit installs in the bottom rear cavity of the frame utilizing the lanyard hole for retention. 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. Its design also allows for use with or without the factory interchangeable backstraps. Will only fit Generation 4 frames. Please note: Includes 1 Nimrod's Wares Microfiber Cloth per order, regardless of quantity purchased. MPN: PG-F130G4. Color: Black. Please note: Microfiber cloth may be tan, gray, or black.