Steve, make sure you talk to Rich on the order, get exactly what you want! (Personally, 1 in 8" is the way to go). Send Theresa a letter so that it is there for them for reference when he starts the build, and to order the barrel blank.
Your dealer does not have to order for you from MOA, but your gun of course must be shipped to an FFL. I talked to Rich today about the wording on his website, and that will get changed ASAP to clarify that.
(If you can clear your schedule, consider coming out to Wyoming to the PD Shoot and Match.)