From what looks like a steel reinforcement, those look like they might be stock pistons from the bottom. Those are the only cast slugs you should ever consider running.
I've never noticed the stockers having such a crappy cast dish though. It might have just been your flash making it look worse than it really is.
I've never noticed the stockers having such a crappy cast dish though. It might have just been your flash making it look worse than it really is.