Just before the beginning of the 5th Corporate War, MTI and Omni-Tek undertook a joint venture to produce a close-combat flechette-based assault rifle, the PF55. When the cooperation ended, OT continued the production. The all purpose bullet is shaped into metal darts are enclosed in a sabot that protects the dart during propulsion initiation and firing. The darts are small, and rely only on their aerodynamic shape for stabilization. It yields low accuracy but high damage output. On the OT-only version two-tone nano filters are added, together with the miniature propulsion accelerators from the PF56.