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The KF7 Special is one of the "Classic Weapons" featured in Perfect Dark. It is essentially a duplicate of the KF7 Soviet that appeared in GoldenEye 007, and which is itself based on the AK-47. It does average damage and is not very accurate at range when firing continuously, and it has a zoom. Along with the AR53, it is one of the only assault rifles that can be dual-wielded.
As a classic weapon, the KF7 has no secondary function, and there is no in-game description.
The use of the KF7 in single player is unlocked by getting gold medals in the firing range, as with all classic weapons. Alternatively, the All Guns in Solo cheat will also give you all the classic weapons. In the XBOX arcade remake, the KF7 is available by default in the Combat Simulator.