So just put this in the category of "
What I think I know" after doing reasearch over a long period of time - a few years ago when I stopped using oils with Teflon...
I would add this point point if you were to discuss the use of Teflon in a bore with most active long range target shooters they would suggest not to. If put it in a bore as it will change accurracy overtime as it fills the metal pores of the bore.
Most match barrel manufacturers say not to use it including Dan Lilja of Lilja barrels.
The last i read even the milatary has now removed it from mil-spec oils. Snipers will not even allow it close to their weapons.
Here is some additional information:
Teflon is ...gasp... PTFE (PolyTetraFluoroEthylene)
Teflon is a registered trademark, a name only.
The problem comes when PTFE/teflon is subjected to very high temperatures, as seen in gunbores during firing.
The teflon outgasses hydrofluoric acid as a combustion breakdown product.
The acid eats the chrome and/or rifling out of the bore over time, causes stress fractures, pitting etc. Exposure to acid is bad for metal.
Hardchrome as found in AR15/m16 barrels is particularly susceptible to this.
The current Mil spec formula for CLP no longer contains teflon.
Generally wiping a bore will not clear the Teflon as it is meant to seek the low spots and migrate into the pores of a metal to provide the smooth ride.
The last thing I would say is for the normal American hunter/shooter - probably would never be a problem... but I prefer to skip it.