I'm assuming an addendum of .984 on both the sector and rack that meet at the pitch point, and I'm calculating as if there is no significant axial shift (center distance). I wouldn't be sure how to measure axial distance with a rack, but thankfully the design doesn't appear to have much spacing...
This is a hobby related question, but one that has stirred up some debate in the world of airsoft replica tech work - and I believe the answer is best answered from the engineering front. I have a conclusion that I believe fits the science, but I wanted to see if the more knowledgeable among us...