NDZ Performance Jentra JP-1 Grip Slug Plug for Glock 17 19 20 21 22 23 24 31 32 34 35 37 38 GEN 1-3 - Plain Jentra JP-1 Grip Plug for GLOCK 17 19 20 21 22 23 24 25 31 32 34 35 37 38 - WILL NOT FIT GEN4 or SHORT FRAME 100's of High Quality Permanent Laser engraved images 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.