I don't know if he is still at this location:
Daniel W Cowen Riflesmith
(206) 227-9280
Location:
224 Wells Ave S
Renton, WA. 98057
Or there is another location (do a text search) here as of 2014:
https://www.atf.gov/sites/default/files/assets/ffls-2014-february/0214-ffl-list-washington.txt
Dan is a true old-school riflesmith (lathe work, I think he has some Bridgeport machine tools) and the 1903 Springfield is his passion.