I don't care for the Defender's stock Heavy Barrel. Maybe I've spent too much time playing videogames, but it's hard to take it seriously as a piece of mobile artillery. Some associations are hard to shake.
This is supposed to be one of the most powerful ranged weapons in the game, right? It should look the part.
So I picked up a 1/35 scale Sturmhaubitze 105mm 42 L/28 barrel from RB Models, a Polish outfit that specializes in turned brass and aluminum parts for historical scale models. This barrel is based on that of a WWII German mobile gun:
Work in progress: