Pearce Grips’ Glock Gen 4 20/21/40 Frame Insert keeps dust and debris out of your Glock Gen 4 pistol’s magazine well to enable more efficient firing.

This insert fits inside the bottom rear cavity of a Glock Gen 4 20, 21, or 40 pistol and uses the lanyard hole for retention. The insert is also compatible with the factory interchangeable backstraps. Made of high impact polymer, the insert is designed to keep dust and debris out of the magazine well to ensure safer and more efficient firing.

• Fits inside the bottom rear cavity of a Glock Gen 4 20, 21, or 40 pistol
• Uses a lanyard hole for retention
• Compatible with the factory interchangeable backstraps
• Made of high impact polymer
• Keeps dust and debris out of the magazine well to ensure safer and more efficient firing