I was reading my field patches instructions in the kit tonight by coincidence, and it clearly states for external parts and to be used with pull through or jag for barrel, as Dean B stated. .............Confusing.
I know that they are generally supposed to be for external use but it clearly states on the packet that it can be used for protecting inside barrel using pull through. I just presumed that you used the blue strips for cleaning and the saturated patches for leaving a protective coating, that's what it says, but I haven't tried it yet on a pull through as I dont do my cleaning like that.
I only got my Napier kit out to use the spray tin for coating my VFG felts to use on the rod for a light pull through.
Dean C agreeing with Dean B........