Did a full strip, carrier, bolt, gas tube and handguards just to get all the cosmo out. Lightly lubed the carrier, bolt, receiver rails, hammer and disconnecter (all bearing surfaces). Did not run anything through the gas port and down through the barrel, however.
I'll try a patch through there and see what comes out.
Cosmoline was everywhere, but mostly in the receiver and especially heavy in the carrier's recoil spring "hole."
Thanks fellas.