Flex-HoneŽ for Paintball Guns Manufacturing & Supplies: Brush Research Manufacturing
Select a "barrel" type. Select Levigated Alumina. Select "Extra fine" This is about 1200 grit, I believe. That will be the finest hone and will remove a minimal (if any) amount of material on your barrel.
There is a huge thread on this HERE
. Look up the user agentSmith, he has posted a lot about flew hones. Some swear by flex honing.