The Killer7 is a Magnum available in Capcom's Resident Evil 4, which is based off of the real-life handgun, the AMT Hardballer (which, in turn, is based off the Colt M1911). Although its similarities with the AMT Hardballer are striking, there are some noticeable differences. The sights are nowhere to be found, and the trigger is skeletal.
In game, it can be purchased from the Merchant for 77,700 PTAS. To fully upgrade the Killer7, it will cost players a total of 337,700 PTAS. It takes up 8 spaces.
The gun is named after Suda 51's Killer7, originally developed for the Nintendo GameCube as part of the notorious "Capcom 5," five games which were to be GameCube exclusives. Only four of them came out, including Killer7 and Resident Evil 4 (both of which were later ported to the PlayStation 2 and, in RE4's case, would be released on many other systems throughout the years).