The original is a service pistol for the British army and many other armies throughout the world: the GLOCK 17 Gen4. This replica can do almost everything the original can do. For one thing, it can be stripped down completely for easy cleaning and inspection. This gas-powered airsoft version of the GLOCK 17 Gen4 features a metal slide and blowback. Like the original, it has interchangeable backstraps to provide a non-slip grip for hands of any size. The 6-mm BB’s are accelerated to an energy of up to 1 joule, and the adjustable Hop-up guarantees maximum precision.