AR break-in (assuming a chrome lined barrel) is simplicity itself. BE SURE the bolt carrier/bolt assembly is well lubed with CLP. In the case of break-in, wetter is not necessarily bad. Excess CLP will fly-out anyway. As for the barrel/chamber, just a few passes with a brush and then patches until they come out clean is fine. Some folks consider their AR's "broke-in" after as little as 200 rounds. My opinion is 500+ rounds (from experience).
Oh, since your AR is chrome lined, there is no need to leave a film of CLP in the chamber/bore area for short term storage (6 months or less). These areas are highly corrosion resistant, and are unlikely to rust. In fact, a film of CLP in the bore will cause reduced accuracy/altered point of impact for the first 5 or so shots.
A bore snake is a nylon rope with brass brushes built in and a weighted end that drops through the bore. Think of it as a flexible cleaning rod, that can be rolled up and also tossed in the washer. The idea behind the bore snake is that due to the large surface area it will only take one or two passes to make the bore clean. The bore snake is OK for AR's, but not very effective in getting the barrel truly clean in my opinion.
I much recommend the OTIS kit over any other cleaning device short of going whole-hog and getting a dewey one piece stainless steel coated cleaning rod and a breech-end cleaning rod guide.