Are we gonna include what games the guns are in?, because there are a variety of guns in a variety of games, (Grand Theft Auto, Call of Duty, Half-Life, and etc. etc. etc.)
Some articles have a trivia section about media they have appeared in, otherwise it would be way too lengthy to list a thing like this, especially for most well known firearms. I suggest looking on imfdb.org to see guns in video games as well as other digital media.
