Gun is a Revisionist Western-themed video game developed by Neversoft. It was published by Activision for the Xbox, Xbox 360, GameCube, Microsoft Windows and PlayStation 2. The game was released in North America on November 8, 2005, and in mid to late November in Europe. Since October 13, 2006, the game has also been available to buy on Valve's content delivery platform, Steam. It was released for the PlayStation Portable under the title Gun: Showdown on October 10, 2006. It features new side-missions, a multiplayer mode, and other additions that weren't available in the console versions. In its first month, the game sold 225,000 units across the four systems it was initially released for. According to TRST sales data, the game has sold over 1.4 million units in the US (as of October 2008). It was well received by professional game reviewers and Activision noted that Gun sold the best among new video game properties. The game won Gamespy's "Xbox 360 Action Game Of The Year" award.
You need a Pentium 4 2.4GHz or Sempron 2600+ processor coupled with a GeForce 9300 GE to run Gun system requirements at recommended. You can expect to get around 60FPS at 1080p screen res on high graphics settings with this hardware. System memory for min is 256 MB. To summarise, Gun needs around a 11 year old PC to play at recommended settings.