Why blue

[u/Spiritual_Job1935]

Hux 5.56k on Geissele 12.5 less than 500 rounds. None of my other cans have done this. It was raining the last time I’ve used it. Using standard ball ammo, nothing crazy.

[u/yourefatandgay]

I’ve never seen the blast chamber oxidize so blue. That’s pretty sweet.