I sent them an email and they confirmed they can inlet for the Christensen Arms action. They said to just put that in the remarks if you order online, as that action isn’t an option in the stock builder. He said approximately 6 months wait time.
That’s awesome. I asked them a couple of years ago about a Borden inlet (also same as Rem700 but with side bolt release) and they told me to call a gunsmith. McMillan said absolutely without a stutter.