Also loctite dies not like to cure on coated metals like park or any othet type of coating. This is why loctite has a primerMost grades of Loctite break down with heat, and the rifle is dumping hot gas through the gas key nicely heating those two screws. Staking isn't temperature dependent, and also gives a visual indication on whether those screws have backed out at all. In addition, both parts deformed by staking are replaceable and relatively cheap. The highest service temp I could find for a Loctite threadlocker is 400F, which would probably work - I've never measured gas key temps during shooting. The first indication of a threadlocker failure would be the screws backing out, and I guess I consider the gas system critical enough to stake it and not have to think about it other than checking the staking when the BCG comes out.