All-New Macro-Compact Grip Module Featuring Standard 1913 Rail Integrally Compensated Optic Ready Slide ROMEOZero mounting footprint (2) 17rd Steel Magazines with High Visibility Followers Interchangeable Small, Medium, and Large Backstrap Included 3.1" Barrel XRay3 Day/Night Sights Product Details: Frame Material: Stainless Steel Grip Material: X-Macro Polymer Slide Material: Stainless Steel Slide Finish: Nitron Magazine Capacity: 17 Rounds Sights: XRAY 3 Day/Night Sights Trigger: Flat Striker Fired Weight: 21.5 oz Mfg: Sig Sauer, Inc.