I'm not sure that one is really necessary. The carbon fouling is very easy to remove from the chromed parts. I have an Otis AR-15 assessory kit which is pretty handy with various picks- they have a little 'L' shapedone specifically for cleaning the barrel extenstion lugs- I wrap a patch around it and can clean out the lugs very easily. As far as the chamber goes, I use boar foam followed by pullinga few patches through the bore using the Otis system, I cannot see any crud left in the chamber when I'm done.