I drink the GunKote cool-aide.
I have lots of guns coated in GunKote. They are very well protected. The only place that I oil is what is not painted. I like the product because it is very thin and hard. All steel on the AKs had a fresh park job before painting.
GunKote Flat Tan
GunKote AK Black (hardcooked for a more flattened shine)
GunKote AK Black, which is a semi-gloss with extra black pigment.