The Springfield Armory Echelon Compact Pistol with U-Notch Night Sights retains the key features of the full size Echelon model, with a shorter 4 inch barrel and compact frame for enhanced concealability. It's revolutionary Variable Interface System provides unmatched direct-mount compatibility with today's leading red dot sights, complemented by tritium 3-dot sights for fast target acquisition in any light.The serialized Central Operating Group is housed in a compact frame, offering 15 round capacity with the included flush magazine and 18 round capacity with the included extended magazine.FeaturesTritium U-Notch Iron SightsVariable Interface Optics Mounting System Fits Most Popular FootprintsAccessory Rail for Lights or Lasers10+1 Round Version Includes (2) 10 Round Magazines15+1 Round Version Includes (2) 15 Round Magazines18+1 Round Version Includes (1) 18 Round and (1) 15 Round Magazine