Plain Jentra JP-8 Grip Slug Plug for Glock 26 27 33 GEN 4 by NDZ Performance Jentra JP8 Grip Plug Glock Gen 4 26, 27, 33, 39 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 mag well.