That's the Sig P320 M17. The P320 has been pretty popular as a Glock alternative for a while but the M17 variant is the one that the U.S. army adopted a few years ago. The only real noticeable difference from the full-size P320 is the shorter frame and coyote tan color.

The carry pistol is Sig P365, the shotgun is a Mossberg 590, and the ar is a Springfield Armory Saint, the 1911 is a Colt 1991 A1 and the ugly black pistol is a Walther Creed which is their poor man's model.

Haha Yeah I actually ran across your gun themed community not too long ago. This place needs more of that sort of content. Maybe I'll write something in that vein at some point.