Manufaturer Part Number: 365XF9COMPRXSLSlide Integrated Expansion Chamber with 3.7" BarrelAggressive FUSE Slide SerrationsEquipped with ROMEO-X SIG-LOCTM Compact Circle DotFully Enclosed, Sealed and Gas-Purged Optic System, and Assembled in the USAMounts from Underneath the Pistol Slide, Utilizing the SIG-LOCTM Mounting System, for the Strongest Lockup in the IndustrySide Battery Allows a Low Deck Height and a Standard-Height Iron Sight Co-WitnessPolymer Grip Module with 1913 Accessory RailInterchangeable Small, Medium and Large Backstrap IncludedX-RAY 3 Day/Night Sights(1) 17rd (2) 21rd Steel MagazinesCALIBER 9MMFCU MATERIAL STAINLESS STEELGRIP MODULE POLYMERSLIDE MATERIAL STAINLESS STEELSLIDE FINISH NITRONMAGAZINE CAPACITY 17 OR 21 ROUNDSSIGHTS X-RAY3 DAY/NIGHT SIGHTSTRIGGER FLAT-FACED, STRIKER FIREDOVERALL LENGTH 7.2 inOVERALL HEIGHT 5.7 inOVERALL WIDTH 1.4 inBARREL LENGTH 3.7 inSIGHT RADIUS 5.5 inWEIGHT W/MAGAZINE 23.4 oz