The Glock 17 Gen4 introduced interchangeable backstraps, dual recoil spring assembly, and a rough texture frame (RTF) option to the G17. The Gen4 dual recoil spring improved felt recoil and extended spring life. The Gen4 G17 served as the primary LE duty pistol for many agencies from 2009 through the Gen5 release in 2017, and remains in active production for specific contract and export markets. Type: Pistol Action: Striker-Fired Caliber: 9mm Capacity: 17 Year introduced: 2009, Austria Weight: 25 oz Overall length: 8.1" Status: Discontinued Military use: Yes Intended use: duty, competition, carry