I haven't fully assembled it on the guy. With z magazine but i simply milled the barrel so it can be clocked 180deg so the feed port in the barrel is vertical. This barrel also has the milling for a right feed like normal T9/9.1 type feeds, but now also has the milling to go 180deg for vert feed. It should still function normally for both mag feed and right feed (if I had a right feed t9 body).
I had to stagger the bolt holes going into the body at an angle because after milling out the hole in the body, there is very little meat left in the center for drilling and tapping, almost none really it would not have worked at all. More pics to come, I need to grind down some bolts toothed proper length then it is ready to test out.