DO NOT Buy a pre assembled kit. Most are aluminum rods that will collect grit and be like running sandpaper down the bore.
Buy a good one piece coated 44" rod from either Dewey or Bore tech. I like Bore Tech best.
buy a Dewey-Pierce style 6.5 jag that allows you to pierce a patch or wrap it.
Buy the following items to go with it. Nylon bristle bore brush, Sinclair action cleaning kit (ACT-2) this is to clean chamber and action after cleaning bore. I use large shotgun patches around bore mop on tool to soak up solvent. Action and bore must be clean and dry before firing. then lube bolt.
Use either Montana extreme or Butchs Bore shine solvent, JB Bore Paste (for cleaning carbon build up in throat and first couple inches barrel), either Sinclair bolt grease or Montana gun grease ( to keep lugs lubed and engagement points on bolt to prevent galling)
you will need a bore guide also, either Stoney Point or the Bore tech. I like the bore tech as it catches any spilled solvent.
small penlight helps to inspect crown and bore as you are cleaning to deteck any remaining copper.
either buy or build (wood) a cleaning cradle as shown in sinclairs.
all of these can be seen and purchased at Sinclair internatanials site. www.sinclairintl.com