I did a search and found a couple of very old threads on using this product but wondered how many others use it to clean the carbon ring? I've found that it cleans the carbon ring much easier on stainless barrels. Almost no scrubbing and I simply cut patches out of the cloth and run it into the chamber from the receiver end if I want to clean the carbon ring only or push it all the way down the barrel if I want to remove all the lead. Here is a bore scope of my Shilen barrel first after using C4 and some hoppes lightly with a nylon brush. Then after five minutes and a couple of Birchwood Casey patches.