I have been working on this project for a while...
Sometimes when we have more time than money we get to creative...
I had an extra forearm that was painted black. It was a factory TC forearm for a standard taper rifle barrel. I REALLY need a forearm for a full bull pistol barrel with two hole pistol barrel spacing. Here is were we had fun. I got a 7/8in dowel rod and covered it with sand paper. I spent the next 1 1/2 hours sanding the the grove to full bull and then an another 1/2 sanding all the stupid paint off and drilling a hole fore the pistol adaptation.
Ps, ya... the forearms wasn't "square" as well. I had to adapt and overcome. LOL
Before picture...
After...
The hole was square on the outside but got off a little on the inside... oh well...
PS, here is what my 8mm GNR now looks like...