1. Think about storing your rifle muzzle down. Oil follows gravity and too much oil will eventually end up in your buffer tube, along with all the carbon and junk that comes with it. The muzzle device will protect your crown from damage.
2. Don't take off the gas block unless it looks like it is on incorrectly. The gas block will build a seal from the carbon, making it nearly air tight. That's a good thing!
3. You can artificially wear in your parts as well. Get some 0000 steel wool and oil, then work over the BCG and upper receiver. It won't take off any material, but will smooth out any roughness.
4. Chuck a chamber brush into a hand drill, lube it up real good, and run it high speed in the chamber for a bit. You'll chew your brush all to shiit, but that's replaced for less than $5. It should polish everything up real nice.
I don't suggest using any polishing compounds. They speed things up, but they're also acidic and extremely difficult to completely remove when you're done.
How do I know if it's properly gassed? Shells eject at the 3 to 4 o'clock, into a neat and tidy pile, about 3 feet off my right hip... and the bolt automatically locks on an empty mag.