I know Ive mentioned this in the past,so forgive the repeat.
PTFE burns at 1% per hour at 900F.Now thats a sustained temp,not just hot for a few seconds or minutes.So I suspect that if you heat your weapon up to that temp for lets say an hour,which is when the slight possibilty of the PTFE creating HF/hydrofluoric concerns,then there is going to be many other concerns with the weapon.Namely pretty much anything polymer is gone,barrel warp and I sure the aluminum receivers are going to suffer dramtically.You know we are talking about right at cherry red type hot man.
I dont buy the accuracy issues either.Personally I think most of this is internet and some gun oil manufacturers hype for the most part.If PTFE caused corrosion Im pretty sure that it would be evident with the PTFE coated cookware we have seen for the last decade or so.Personally I have yet to see a hole in a frying pan caused by acids from heating PTFE coatings up.The coatings do come off and are damaged very easy,but thats it.Yeah Ive accidentally set fire to a PTFE coated pan before.
Im not a good cook.
Furthermore I have used gun oils containing PTFE for well over 16 years and have yet to see an issue,corrosion or accuracy,in that time.That includes using Mil-comm which probably contains more PTFE than anything on the market besides Tetra.
So I would not get caught up in it all too much.The environment will get your metal objects long before the PTFE.
Some other oils cause hydrochloric acids/halides at much lower temps.Also burning some pure state oils creates acids just from the petro base as byproducts.
Another key function to look at also is the fact that most of the decent gun oils use some sort of inhibitor package to further reduce any issues.Break Free has contained PTFE in its formula from the start.Thats been around 20 years now.I think if there was going to be a problem we would have seen it.
So Im not on the PTFE bashing boat.