That “Team America” model doesn’t make it obvious but that thing on the port side is the long, snaking ammunition feed for the 20mm. Actual photographs show it in greater detail.
Rather awkward methinks.
Good Luck trying to sell to other ‘third world countries’. As long as the engines are the Rolls Royce/Honeywell CTS-800s, Turkey would be required to get permission to re-export.
Running along the outside of the fuselage allows it to be outside of the armor as well, so any cook-offs from ground fire striking the belt won't be inside the airframe.