The Warne Glock 17/22 Magazine Extension increases the capacity of Glock 17 and 22 magazines by 5 rounds, making it an essential accessory for enhancing magazine performance. This extension features a length of 13 inches.Key FeaturesModel Fit: Specifically designed for Glock 17 and 22 models.Caliber: Compatible with 9mm ammunition.Capacity: Adds a 5-round capacity to your existing magazine.