Used on almost every German aircraft during WW I:
Albatros D.V, Fokker Dr.I, Fokker E.V, Fokker D.VII, Pfalz D.III, LVG C.VI and many other.
The set includes parts for two complete machine guns - 3D printed parts and turned brass barrels.
The set also includes 3D-printed ammunition belts (full and empty).
Simply replace plastic parts and it will make your model extremely realistic.