An easy to find source of suspended colloidal graphite is your NAPA auto parts. They sell a 3.5 oz. bottle of LOCK-EASE at around $3.00. Part # 765-1382.
It is colloidal graphite suspended in a petroleum distillate. Just 2 or 3 drops on a patch and run throough the barrel after cleaning and you are ready for great things.
I went to Tony Boyer's school a couple of years ago and after cleaning my barrel, Tony asked if I had any Lock Ease. If it is good enough for him, it has to be ok....and I do not mind shaking it up before use.
Hope this helps.