Some of my JMF A&M eggs fit into the quail rails, some didn't. I had to use a combination of quail and chicken rails in my last batch to fit all the eggs.
@ StaticChaos
How did you cut away the sides of that quail rack? What tools did you use? It looks partially melted. I have the same rack and I am expecting a batch of jumbo eggs soon so I want to be ready.