In addition to the Springfield Mark 1, Pederson was also asked to develope his device to work in the Model 1917. I know little about the Mark II, only what I've read and I did see one on an auction some time ago. Brophy shows the rifle on page 163 and 164 but little in depth details.
Anyway, I ran across this trigger on flea bay and picked it up.

Thought some here would find it interesting.