For those of you interested in arms-related questions, the folks at Lucky Gunner email to draw your attention to their recent tests. They've passed tens of thousands of brass and steel cased ammunition through Bushmaster AR-15s, and have a report on the effects of each on weapon accuracy and reliability. Conditions were pretty rough at times, between rain and sandstorms in the Arizona desert.
Of course, if any of you are inspired by this to go out and buy an AR-15... good luck! As D29 points out, there's little need for gun control on these weapons right now. You couldn't find one to buy if you wanted.