he says that some of the realistic guns in games like battle field and CoD are actually licensed by the gun manufactures, since they're using the likeness and name of the company's trademarks.
therefore, when you buy a game that has these virtual guns, by extension, you are giving money to gun makers and this could create an ethical dilemma for people who don't like guns in real life but have no qualms about shooting digital people in the face with the super realistic virtual guns.
Its nice of him to point this out for people who care.... although, I find it interesting that there are people who like shooting fake guns yet are so adverse to real guns that they don't want manufactures to profit. Like, if you're that anti-gun why do you play gun-based video games? And on the flip side, if you can understand the fun of shooting guns in video game, can't you maybe understand why people like to own and shoot them IRL?