The Glock 19 Gen 6 is a compact 9MM striker fired pistol built with a 4.03 inch barrel and a durable custom finish. This model offers a 15 round capacity and includes an updated optics ready system that increases compatibility with modern red dot sights. Ported Barrel. The Glock 19 pistol uses a polymer frame with interchangeable grips and fixed sights that support versatile performance for concealed carry, duty use, and training.