During the Second World War, several various AA gun configurations appeared on German submarines. Some of the Type IX as well as the earlier Type VII submarines were armed with the 20mm Flak-Vierling four-barrel guns (Vierling = quadruplet). The Flak-Vierlings were used also on other vessels of the German Kriegsmarine as well as on Wehrmacht’s AFVs. This nicely detailed, 3D-designed set contains resin parts, turned metal gun barrels and a fret of photo-etched parts.