The Slavic Dragon Barrel was based on the barrel of the short-barreled PM md. 90, a Romanian AKM-based carbine. This specific model was designed for use by tank crews in the closed confinements of their armored vehicles, hence the extra short barrel like the one featured in-game.
It may also be a reference to one of the export names for the short-barrel PM md. 90: "Draco."