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I have never heard of wetting a brush. Wet and dry patches, but not a wet brush.

I bought a Rock River match stainless barreled upper a while back. They told me there is no break in procedure, just start shooting and enjoy it. Barrel break procedures vary widely. I would think a using a bore snake every so many rounds at first would be the easiest thing to do and would effectively remove any debris from the barrel if needed. I think it all depends on how they make the barrel and how it is treated afterward. I think there are things they can do to the barrels now that effectively remove the sharp edges and such that a break-in might take care of.

The Otis cleaning kits have plastic jacketed cable to pull the brush or patch through. They work pretty good. Just make sure you don't use too thick a patch or fold it wrong.

Two other helpful items:
1. Get an AR chamber brush. If the chamber gets dirty, it can make extraction harder. Steel case ammo will dirty up the chamber faster than brass cases. One of those lessons learned with my first AR.
2. This tool is very useful for cleaning up the bolt, firing pin, and carrier. Really helps get off the caked on stuff.
http://www.brownells.com/gunsmith-tools ... 31857.aspx" onclick="window.open(this.href);return false;
3. Spare parts like spring/pin kits and spare bolt with extractor are relatively cheap if you have a few extra bucks.