Anybody who says that the AR doesn't like to be wet, or needs meticulous maintenance schedule, isn't familiar with this lil nuance....
Here is an AR after having gone 30,000++ rounds with only 1 cleaning and a couple cursory wipes of the BCG. The key to keeping an AR running thousands of rounds without maintenance is quality lubricant.
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To make clear: This is not to say this is how you should maintain, or not maintain rather, your weapon. This just illustrates that they will go the long haul with very little maintenance and a healthy dose of lube. I would suspect this rifle probably wouldn't make it through a case and would have excessive wear and breakages if run dry....
That and being able to space out the 30,000 rounds over the course of 6 weeks, not being bum rushed by taliban