The round receiver and square trunnion did not look very smooth so I slabbed the Suomi receiver to match the AK trunnion and TIG welded them together.
Heavy weld on top~
Welded and unitized ~
Now I need to tack the rear magazine latch in place. I already set the length by milling the AK trunnion legs but also need to set the proper mag height. I need some other key pieces to do so…
At this point I need a bolt and carrier to set the proper height. I modified the AK carrier by making a spacer and cutting off the front section of a Suomi bolt then TIG welding it to the AK carrier. Getting this centered and straight is important, if you want it to work!
CAD data for piston to carrier center line~
I needed to turn a spacer ring, cut a segment out to properly set my center line dimension. I used an alignment arbor I turned to set my alignment.