You dont need an AR cleaning kit.
The MOST important thing to clean an AR is the chamber with an AR chamber brush. Some people just run a bore snake down the barrel, or a .22 caliber bore brush, which completely misses the entire chamber portion of the rifle.
AR chamber brush
I have 100K rounds down range in AR15 platform rifles and I have not once cleaned the barrel of copper. I run a bore snake down the barrel 3 or 4 times, clean the chamber with a chamber brush, clean the bolt carrier group, and that's it. The only people that should be worried about copper build up is those with high dollar precision stainless barrels, that shoot in matches. If that is not you, then dont worry about it.
One tip that I have learned over the years, is that the they sell "Star chamber" cleaners to clean all the gunk out of the barrel extension area where the bolt locks to the barrel. These "star chamber" cleaners are about worthless. Just find a pressurized can with those little red straws (I used Remoil aerosol can, but brake cleaner would work fine too), invert the upper so the flash hider is on a cleaning rag, on the floor, and blast the area with the little straw. Any carbon, gunk, metal shavings, and goo will be blasted down the barrel, and the receiver extension will be spotless. Quickest and easiest way to clean it.
So all you really need to clean an AR15 is
1) AR15 chamber brush
2) aerosol cleaner with little red spray straw
3) cleaning rags
4) bore snake
5) cleaning rod handle for the chamber brush
Brownells sells this upper receiver cleaning kit. The handle is REALLY high quality and will last a life time.
http://www.brownells.com/gun-cleaning-ch...rer_1=brownells