.40 S&W cal., 4.48 in. barrel, similar to G22, except features (less polymid traction) Rough Textured Frame (RTF-4) with recessed thumb rests, finger grooves, accessories rail, and interchangeable frame backstraps, includes a reversible enlarged magazine catch, dual recoil spring assembly, and a new trigger system, 15 (optional 10, 16, or 22) shot mag., fixed rear, adj. rear Glock steel, or Glock night sights, standard black, optional FDE (limited mfg. 2012-current) or Gray (limited mfg. 2015-current) finish. New 2010.