Rockwell hardness on finishes
Caveat: please save me the inevitable "You don't need to clean that" when it comes to the bolt tail. I do and will continue to do so. This is a technical question.
Was looking at a company called TR-Enabling and a finish they have called Obsidian. They do a mil-spec BCG in it. It is a nickel-Teflon finish but has a Rockwell hardness of 70 (NP3 has a Rockwell of ~ 50). Now having spoken to Robar a few years ago I found out that using a brass/bronze bore brush to remove the bolt tail carbon deposits on NP3 is a no-go. So is the trusted old green scratchy pads we used in the Army. Have to use a nylon bore brush, and it takes a while to get my NP3 bolt tail spotless using that. My hard chrome bolts, where I can use a brass/bronze bore brush or scratchy pad, clean up really quick.
1) What is the Rockwell hardness of brass or bronze bore brush bristles?
2) I assume you can use a brush with a lesser Rockwell hardness on something with a higher one without removing the finish, right?
I'll bet tom12.7 has a slew of info! (hint hint)
11C2P '83-'87
Airborne Infantry
F**k China!
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