In recent years, reports The New York Times, the firearms and video game industries have quietly forged a mutually beneficial marketing relationship. The McMillan Group, the maker of a high-powered sniper’s rifle, and Magpul, which sells high-capacity magazines and other accessories for assault-style weapons are listed as partners of the Electronic Arts, a maker of video games. Assault-style rifles made by Bushmaster Firearms have a roster of credits on various video games. Many of the same producers of firearms and related equipment are also financial backers of the N.R.A. For example, Glock, Browning and Remington are listed as corporate sponsors of the NRA.