I use remington bore cleaner for my ports.Comes in a nice little bottle,tip fits the holes ,drop a bit in each port,then spread some in chamber.Position gun so it drains down while I get the Hoppes 9 out.put a patch on,run it down and back barrel.then use a swab down .Then I run a snake down.Then I spray rem oil in each port,and in chamber ,again position gun so oil can start running down barrel.Put first snake away.Get second snake out,run it down barrel.Then,one more time rem oil in ports,then Gunzilla around chamber,position gun so it runs down barrel again.Put second snake away,run third snake down barrel.Spray gun with rem oil,then rub down with rag.
Works for me,no build up and barrel clean.
Doug H.