9mm Para. 4.49" barrel length. SN: ADD178US. Black Nitron finish to the slide and metal surfaces with black synthetic frame without thumb and finger rests or finger grooves. Short recoil operated striker action autoloading pistol fed by detachable double stack magazines. Mounts Trijicon tritium night sights, an extended slide stop, enlarged magazine release, and a flared magazine well extension. with the well widened to match the extension. Features a standard Glock pattern smooth trigger, and a frame without an accessory rail. Item shows standard make and model markings, and comes with one standard Glock 17 Gen 3 pattern magazine.