This is an Sig Sauer P320 RXP (Romeo X-Series Pistol) Compact. It features a 3.6-inch barrel, a compact X-series frame with the flat trigger, TG H3 night sights, an optics cut slide, and two 15-round magazines. Comes with an IWB holster.
The P320’s modular frame system is revolutionary and the overall design was adopted by the U.S. Military in 2017.