PISTOL: HS PRODUKT MODEL ECHELON IMPORTED BY SPRINGFIELD, SERIAL NUMBER BK186658, SEMI - AUTOMATIC, 9X19MM, BLUE / CCH, CASE NOT INCLUDED, 4.5" Notes: Springfield Armory Echelon 9mm Semi Automatic Pistol Bundle with Viridian Comes with one magazine Caliber: 9mm Luger Action: Striker-fired semi-automatic Barrel Length: 4.5" hammer-forged steel with Melonite finish (1:10 twist) Chassis: Serialized Central Operating Group (COG) modular system Optics System: Variable Interface System (VIS) providing direct mounting without adapter plates Frame: Black polymer with interchangeable backstraps/grip modules Sights: Tritium/Luminescent front with Tactical Rack U-Dot rear, co-witnessing with the optic Controls: Fully ambidextrous (slide release and magazine release)Overall Length: 8.0" Weight: 23.9 oz (unloaded)