Some uses may constitute nominative fair use. This question cannot be answered without understanding the specific context of each particular name that you use. So, don't advertise your video game as a Beretta video game or Winchester video game, and just refer to use of the brand name products in what is called 'nominative use' and it's highly unlikely you will draw any objection. When you start using 'Beretta' or 'Glock' or 'SIG Sauer' or other company name, the key is to not imply that company has anything to do with your game, unless a company has been foolish enough to license you to use their name in your video game, which is highly unlikely. AR-15 is a generic, a military designation. (Winchester makes sporting rifles and military rifles, not handguns.) AK-47 is a type (stands for Automatic Kalashnikov) of gun rather than a maker, so that is generic. But where they chose to show a Winchester police round being misused to kill a cop we usually were able to get that stopped by veiled threats of expensive litigation. I used to object to Winchester ammo or guns being shown in Law & Order, CSI or the like by villains, but had no problem with Winchester law enforcement ammo being shown in the hands of the cops, provided it was done accurately. Neither Winchester, nor Beretta, Remington, Savage, Ithaca, Sturm Ruger, Colt, H&K, or any other gun manufacturer will object if your use is purely descriptive and not derogatory. I was for a dozen years, the Chief Trademark Counsel for WINCHESTER.

Real life video game guns