Ok, here is the skinny on the Atlas mount.
I had talked to Adam back in early September about making me a mount for my R3. We had some discussions about the same footprint but longer. In October I sent him my gun with an R3 on it, and a second R3 in the box. Part of what we discussed was building a new gun specifically for the R3 and their mount.
Basically the mount is dead centered on my heavy dustcover gun. My additional request was for a blast shield as with the barrel ports on the gun I had I was coating the lens, and they are not the easiest to clean off.
If you see me out and about feel free to ask to see the gun or mount.