Heckler & Koch VP9A1 K Tactical, Semi-automatic, Striker Fired, Polymer Frame Pistol, Compact, 9MM, 4.7 Threaded Barrel, M13.5X1 LH Thread Pitch, Matte Finish, Black, Suppressor Height 3-Dot Sights, Tritium Front Sight, Optics Ready, 10 Rounds, 2 Magazines, Includes Vortex CCW Closed Emitter Red Dot 81001368 The VP9 Tactical OR features a 4.7-inch hammer-forged barrel with a threaded muzzle and suppressor-height sights. These sights offer a 1/3 co-witness through the window of a red dot sight while remaining visible over most suppressors. Additionally, this model includes an optics cut that, when paired with one of nine available adapter plates, fits most popular red dot sights. Simply add the right suppressor and/or optic with no extra modifications needed.