If I'm not mistaken, the 566 doesn't have ANY titanium in its construction. The lock side is stainless steel (440 I believe). I'll likely pick one up after the holidays as I've got the 561, 560BW, 550, Cryo and Thermite to hold me over in regards to Hinderer designs.
My 560 is pretty but I want it smaller thank god they have the 0566 but no 3d Ti
I was about to pull the trigger on the xm-18 3.5 but went with the 777m390 instead.