This part is made to fit Gen4 Glocks and is interchangeable for right and left hand shooters. This item will make it easier and quicker to perform magazine reloads. Because the push button is larger, you don't have to alter or change your grip to depress the magaziner release button! Machined from durable anodized aluminum, easily installed in minutes! You can engage this snag free Extended Aluminum Mag Catch without breaking or changing your grip and, it makes the grip more comfortable for your thumb! Will not interfere with concealment or duty holsters. Fits 9mm, .40 cal, .357 Gen 4 Glocks only.