The 10R-9mm-RG has a 10-round capacity designed for 9mm rounds. Utilizes a rear spacer and a cut out in the front to allow rounds to exit without hitting anything and slowing down, this magazine is the best feeding 9mm magazine on the market. Caliber: 9mm Size: For use with Government - Commander - Full Size grip length pistols measuring 3 1/8"" center to center on grip screws Round Capacity: 10 Rounds Basepad: (BP-P-.500 // BP-A-.500) Polymer or Alloy // Removable // .500"" height Follower: (FOL-FLX-9mm) All metal follower ""drop leg"" for Tripp 9mm caliber magazines only Spring: (MS-12C.042) 12 coils .042 diam Mfg: Tripp Research