So I purchased a few boxes of 5.56 tracer rounds just for some fun. When I opened the box I noticed the discoloration on the brass of quite a few of the rounds. Are these safe to shoot? What is the deal with the the color?
Its annealing but its not to harden the case neck, its to soften it and make it less brittle. You don't see it on most factory ammo (its there and has been done on it) because they tumble and polish the brass after annealing. The military brass is not polished. They don't care if its pretty or not.