This is the Glock 43. It is a 9mm Luger subcompact semi-automatic pistol. It has a 3.41-inch barrel and a 6-pound trigger pull. The Glock 43 is not a striker-fired pistol but rather has a DAO trigger (double-action-only).
Also, the Glock 43 is also not a modular weapon system like the Glock 19, meaning that it cannot be easily converted to another caliber.
The Glock 43 comes with two 6-round magazines, one with an extended floorplate and one with a pinky extension.