I am intrigued by this tool originally brought to the community by The Firearm Blog:
I am an anal retentive gun cleaner, when I set out to clean. I get over this obsession by trying not to think about it. But when I tear down a gun for cleaning, I want everything immaculate. This tool would seem to be tailor made for the anal retentive.
I say that because I’ve never been convinced that buildup on that particular part mattered in terms of function and reliability of the system. Certainly the rings need to be clean, but do you care about the part that shown being clean in the video?