Something that has always bothered me about Garry's Mod 13 is how they decided to chage the way the player character aims the HL2 pistol when equipped, nowadays aiming it with one hand only (though they do hold it in both hands when crouched). Compared to how human NPCs aim pistols in both hands, I think players with the current pistol animations look really silly, especially when they equip custom pistol SWEPs from the Workshop whose viewmodels show the gun being held in both hands.

With your help, I just want to keep only the old pistol animations for the upper body from this addon, along with the rest of the otherwise better-looking Gmod 13 player animations. Maybe you could make and post on the Workshop a new standalone addon that replaces the current one-handed pistol animation with the old one. If not, maybe I would do it myself with your permission first, though I have zero experience with making addons :/