Teflon serves zero purpose IN a bore. I cant think of any reason i would want it IN a bore. I can think of several reasons NOT to use it. Teflon burns, when it does it creates a residue and toxic fumes.
http://www.imageseek.com/m1a/M14_Preser ... cation.pdf
Experience of the U. S. Marine Corps found that when CLP containing PTFE additive was
left in the bore of a M14 rifle it would shoot erratically until the CLP had been blown out
after the first fifteen to twenty rounds of fire. The accuracy would return indicating the
washing out of the CLP with its PTFE additive
It melts at 621 degrees Fahrenheit.
At 680 degrees Fahrenheit - difluoroacetic acid (DFA), hexafluoropropene (HFP), monofluoroacetic acid (MFA), perfluorooctanoic acid (PFOA),tetrafluoroethylene (TFE) and trifluoroacetic acid (TFA)
At 878 degrees Fahrenheit - silicon tetrafluoride (SiF4)
At 887 degrees Fahrenheit - perfluoroisobutene (PFIB)
At 932 degrees Fahrenheit - carbonyl fluoride (CFO2) and hydrofluoric acid (HF)
At 1,112 degrees Fahrenheit - octafluorocyclobutane (OFCB), perfluorobutane (PFB) andtrifluoroacetic acid fluoride (CF3COF)
At 1,202 degrees Fahrenheit - carbon tetrafluoride (CF4)