.40 S&W cal., similar to G17 Gen 5, except has Rough Textured Frame (RTF), SF (Short Frame), 5.31 in. "match crown" barrel with hexagonal rifling, Glock Marksman Barrel (GMB) with less aggressive polymid traction, 10 or 17 shot mag. standard, 19 or 33 shot mag. optional, 4 1/2 lb. trigger pull, Glock MOS (Modular Optic System), adjustable rear sight, grip without finger grooves, redesigned firing pin and safety, includes interchangeable frame backstraps, ambidextrous slide stop levers, flared magwell, recessed thumb rests, accessories rail, reversible enlarged mag. catch, optional "FS" front slide serrations, nDLC black finish, approx. 26 oz. New 2021.