Originally Posted By ARogueNinja: I'm not sure, I just modified a rifle length gas tube to work... easiest part, might order an intermediate length one in the future but for now it's good. Now I just hope to find out some more info on it.
When I saw the completed rifle pictures in the KAC Gear thread, I knew you had found a path forward
I measured one guns which has an intermediate barrel and forgot to mention that in my post. The numbers I came up with didn't seem too compatible with the URX3 I was measuring against, so it seems your course was the correct way.