That actually looks like it would work well in the 30 Carbine as well. I have one of the Ruger BH's that I know it would. Like Beagle said with that lube groove all it would be required would be size to fit, or maybe throw on some powder coating first then size.
I have a nice
Accurate 31-115H that I got from a fellow over on CB's. It shoots great and hits pretty hard for what it is, out of the BH. I touched base with TOm and he drew up a bit heavier version the
31-125F with a GC on it but I just haven't had time to have him build it yet.
Just too many irons in the fire for only one of me.