So my CAT M4 tool grew legs(I lost it), I picked up a Real Avid The AR15 Bolt Scraper from Brownells, I am in no way a anal gun scrubber, the sun sets on dirty weapons all the time in my house, the package has a nice picture how to on the back of it with the 12 spots to use it on, and lines to cut out if you want to save it, after 5k or so rounds my non chrome or coated FA BCG was really nasty, a couple of drops of Fire Clean on a rag did an excellent job of removing the easy stuff, the tail of the bolt and inside of the carrier came clean with little effort using the Real Avid Scrapper, as did the cam pin, bolt lugs, firing pin, bolt face, for less than 20 bucks I recommend it.
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