The FX Impact high-flow transfer port allows for a larger volume of air through the tranfer port.
This means more speed – When you shoot heavier projectiles like slugs, more speed can result in better groups.
The below tests were done with a standard FX Impact MK1 with a 500mm pellet liner.
Standard Transfer Port: 905ft/s
High Flow Transfer Port: 915 ft/s
Pellet: JSB 18.13gr.
Power Setting: Max