This is TURBO LANZER - the total overhaul modpack for X4:Foundations.
Good news! Thanks to help of other more advanced modders, Turbo Lanzer will have working very interesting feature: small size ships will be able to use medium size turrets.
It is important, because except usual fighters, Turbo Lanzer has fighters-bombers - special very heavy class fighter, slower, but it was supposed to have some super weapon/advantage. And medium size turret - on such a bomber is very very cool idea. Next release - there will be bombers!