If you have any oil in the chamber that bothers you, you can use a Q-tip to get it out. You could spray it with Gun Scrubber first if you like, but it is not necessary. Personally, I only lube the outer surface of my bolt and apply a very light film on the firing pin. In 40 years of shooting the AR platform, I have never had an issue with oil causing any problems in the chamber. The steps I take pretty much eliminates this.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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