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I just recently got another AR, and used a complete m4e1 upper from aero precision. When I attached it to the lower I built I noticed there was some oil around the barrel by the gas block. I thought that was kind of strange that it was so isolated and just in that one particular area. I didn't pay it too much attention but decided to wipe it down so I would notice if it reappeared. I took it to the range about a week ago and noticed more oil in that same area around the gas block. The gun functioned flawlessly for 160 round break-in. Took my rifle home and cleaned and lubed it as usual and made sure to wipe down the oil on barrel behind the gas block again. I left the rifle in safe for a week, just took out to inspect and noticed oil once again on barrel just before the gas block. I attached 2 photos for reference. Is this typical? I never noticed this with any of my other AR's and haven't really been able to find any info online. Any information/advice would be greatly appreciated! I realize yes my rifle functioned fine but I sure would like to have everything how its supposed to be regardless of simply functioning without error. Thanks in advance