I created an MG GM Sniper 2 and did a little bit of a mixing build.
I had a spare shoulder cannon from the MG Origin Gundam, so I attached it, and then painted the optional Gatling gun the same color as the sniper rifle.
As this is a work from quite a while ago, the entire painting was done with a Gundam Marker airbrush.
It's hard to see because I was practicing, but I've also done some weathering.
I like the GM Sniper 2, so I did my best to create it.

GM Sniper 2 Custom Gatling Gun Equipped Type | メントール木木's Gunpla works