9mm Para. cal., 4.49 in. "match crown" GMB (Glock Marksman Barrel) w/hexagonal rifling, with less aggressive polymid traction, includes three 10 or 17 shot mags. (standard), 19 or 33 shot mags. are optional, 5 1/2 lb. trigger pull, new trigger system, choice of standard plastic sights, 3-dot night sights, or Ameriglo bold operator sights, grip w/o finger grooves, redesigned firing pin and safety, Rough Textured Frame (RTF), SF (Short Frame) includes interchangeable frame backstraps, ambi slide stop levers, flared magwell, recessed thumb rests and rails, reversible enlarged mag. catch, nDLC black finish, 25 oz. New 2017.