The KKV-7 10mm SMG Flechette was introduced in Marathon Infinity and was not present in the earlier games. This weapon is a highly accurate at mid to long ranges, but due to the small magazine size and minimum of 2 rounds fired at a time, the user is forced to reload it often.
Vacuum and Underwater Edit
The Flechette is also the only weapon capable of firing underwater without injury to the player, as well as in a vacuum.
The KKV-7 10mm SMG Flechette is first obtainable in Marathon Infinity, hidden behind a secret door on the level Poor Yorick.
"...the flechette, with its small cross-section (4mm), longer body and pointed nose experiences far less wind resistance and thus retains more muzzle velocity over a greater distance with a flatter trajectory that its less advanced "slug-thrower" counterparts. Its armor piercing capabilities rival those of the mighty M1A2 .75 BR and the bio-organic trauma it inflicts is terrifying (being somewhat less effective against mechanical targets)."
- from Marathon Infinity manual