Tim,I'm having Scott (owner) of Springer Precision take care of everything for me.
Quoted from his email:
"We process it here and have a local company that does the anodizing for a large AR15 manufacturer. "
"1-2 weeks, cost depends on the size of the part, frames generally run around $90. "
Scott is on here also but you can email him directly: scott@springerprecision.com
I've heard nothing but great stuff about Springer and I'm so glad they do hard anodizing also.
A few posts down: http://www.brianenos.com/forums/index.php?showtopic=94667
-John