i think wgp called it "titanium", but technically yes its just a clear anno after the metal has been polished. the other parts are chrome or nickel plated.
wgp's guns were always pretty solid stock, the reg is adjustable, just not externally. honestly the only things id change would be to get a delrin bolt, a nicer asa, and lose the drop. maybe another reg if you just want the convenience.
the feedneck may or may not be removeable, i think the later runs of the 04's came with a removeable one. if you look upwards at the bottom of the "pipe" part and it looks like theres a seam, its probably removable. if it looks like one solid piece, it probably is.
some watered down rubbing alcohol is great for cleaning up old gunk, clearns off the yucky residue's too.....i always kept a little spray bottle of it for cleaning guns after playing.
check out www.customcockers.com
for a timing guide. also id put a little grease on the 3-way o-rings while you have it apart, otherwise all it should need is a few drops of oil right in the asa every now and then.