NDZ Grip Frame Slug Plug P2 for Glock Gen 1-3 Biohazard Engraved NDZ P2 Grip Slug Plug for Glock 26 27 28 33 39 - WILL NOT FIT GEN4 or SHORT FRAME 1000+ High Resolution Permanent Laser engraved images, will not rub off, not painted, custom engraving too - by NDZ Performance Fits flush, prevents snagging, debris from entering or reaching trigger assembly and firing pin Quick install using a tight friction fit Helps guide mag. into magazine well