The story:
as Prometheus Defense started taking over more and more of Europe, Finnish resistance forces decided to attempt to take a stand before their time came to be invaded.
Finnish spies captured design plans for a Prometheus design and altered it to be superior in every way while only using parts from scrapped fighters of the age before Prometheus.
The Banshee is capable of destroying Guardians with little effort even with its lack of weapons in comparison.

Features:
A better gun (even though there's significantly less than the guardian)
A centerline hardpoint (currently not in use)
6 wing hardpoints (currently occupied by air to air missiles)

Variants
Banshee B:
https://www.simpleplanes.com/a/4xrJ7W/F-81-Banshee-B