When assembling the weapons, I distinctly remember going "BEAM gatling!? lolwhut?" after seeing it in the manual. Never realized Katoki retrofitted the EW version of Heavyarms with a gatling that fires beam salvos now. Always assumed it used traditional bullets like it's predicessors.
The manual and box art shows the gatling as being a solid, flat black, but seeing as that looked rather boring, I went ahead and did the uneeded: I painted the barrel and end silver and added some gold highlights. I also went out of my way to spray paint the bullet belt(?) gold. Lord, it was a tedius task having to clean and spray all 28 bits of that freaken' belt...and since I freak out at spray paint fumes (even in well-ventilated areas with the wind blowing away from me and when I'm wearing a gas mask), I could only do a little at a time before I needed a breather. The end result tured out ok though, methinks. While definetly not perfect, it certainly turned out well and adds a nice aestetic difference to the Heavyarms' main armament.