Bastion grip plugs are machined from the highest quality T6 aluminum using the highest tolerances to give you the exact fit you require, then hard coat anodized black and laser engraved, giving you the extreme durability you deserve! Compatible withGlock fits Gen 1-3, Models G17, 19, 24, 31, 32, 34, 35, 37, 38.Fits flush, prevents snagging, debris from entering or reaching trigger assembly and firing pin. Extremely quick and easy install and removal, uses spring plunger assembly for retention. ONLY 100% Aluminum - NOT plastic. Grip plug also helps guide magazine into magazine well.You will love the quality of Bastion products. Many different designs to choose from our stock inventory. We also offer custom engraving!