This is a FMK Firearms Striker Fired known as the 9C1 chambered in 9MM, model FMKG9C1EPROBBRT.
The FMK ELITE 9mm is ergonomically built to comfortably fit both large and small hands. The barrel is engineered to sit low for superior point and shoot accuracy and reduced muzzle flip. The new custom designed slide allows mounting of any Vortex Viper" Venom or Trijicon RMR optic right to the slide without any mounting plates!
Features:
New Textured Frame
Redesigned Slide Stop
Beveled Mag Well
Optic Ready Slide
Shorter Lighter Trigger Pull