Ok, so I was planning on going by my local gun store and picking up an AR9 I had recently put on layaway... and of course, something else caught my eye. So instead I brought home a Zastava M90np. I've seen good reviews on it from the AK Operator's Union, and others. So I'm thinking this thing could easily chew through some steel case? Does anyone own one and have any experience with it and steel case ammo? Anyone have one with the furniture changed out, scopes, brakes, etc. they recommend? Thanks!