That Gun其实就是辐射1和2代里的.223手枪换了个马甲。由于安装了机械化的转轮和弹筒吊杆，所以其发射和装弹速度都超过了一般的左轮手枪。但这些装置也使其其重量达到了5磅。枪身左侧有一个绿色的指示灯，装弹的时候会变成黃色并发出提示音。另外，That Gun和GRA补充包新加的普通5.56mm手枪有一项专利是其他手枪所没有的：使用穿甲弹。That Gun is also the least expensive named rare gun that is available for purchase in Fallout: New Vegas.
諾瓦克恐龙商店Cliff有卖。或者可以去储藏室偷出来。It is on the end of the first shelf with the Rocket souvenirs to the right. The storage room key can be pick-pocketed or the lock may be picked (very easy). The key may also be purchased during the quest Come Fly With Me or any time after its completion.
According to Joshua Sawyer, its name is derived from the fact that many players referred to the .223 pistol as "That Gun in Fallout and Fallout 2."
Like the .223 pistol, That Gun is modeled on the pistol used by Rick Deckard, the main character of the film Blade Runner. This version differs considerably in proportions, and lacks the bolt handle, ejection port, and second trigger.
If stolen That Gun from the storage room, Cliff Briscoe still sells it in his shop, creating the possibility to obtain a second weapon. [已核实]
If loading a saved game from the main menu in which That Gun is equipped and drawn, the reload animation takes twice as long as normal. This can be solved by simply switching to another gun and then back again. [已核实]
Rarely, when aiming down the sights of That Gun, when turning right or left the camera will instead pivot from the Courier's shoulders, but the gun will stay in the same spot, causing it to careen to the right and left. One's head can even be moved backwards, to the point of seeing the viewmodel hands. [已核实]