So, I've had my SR40 for a while, and I clean it regularly (after every trip to the range). I've found that it consistently has a decent amount of brass shavings in the striker channel each time I take it apart. Anybody else experience this? Is it normal? I would think this would be a problem, but this is one of my first firearms so I'm not quite hip to what I should expect. I've put ~1000 rounds through it so far.