Okay, the Ruger guys just told me there is nothing wrong with it. That they did them with a pressing machine such that they won't unscrew themselves during normal operation, but if need be, can be unscrewed by their gunsmith. It's done by a different process, if you look at your staking very closely, you can see there is very small amount of metal on screw contact. I realize that doesn't sound very assuring, but they did mention they will send me another BCG and make sure to inspect the staking on this one before shipping it out to me since it's hard to tell from looking at the pictures I took whether the one I have is properly staked.
Say what you want about Ruger, but that is really good customer service.
Upon inspection of my 16" AR556 the staking looked to be the same as you guys have been showing here. So I took that BCG to my gunsmith and both him and the other smith there said the same about the staking being done by a machine causing it to looked as it did. Upon further inspection I could indeed see that the staking was done and in fact is touching the bolts, albeit slightly less then what we generally accept as staked.
I have only a few hundred thru this gun and the key is fine and shows no sign of being loose in anyway.
I will keep an eye on both of course, but in light of your post and what I've come to see, I'm not going to worry all that much at this point. If further staking is what makes one feel better, I say have it done. I'll shoot them as is and monitor them along the way. If problems should arise I'm not worried about Ruger making it right.