Ok, every one, I am not at all a know it all, but I do work with a guy who is an US Army Vet from the first Gulf War era. He has spouted that every one knows that a 5.56 bullet bounces around in the barrel after initial discharge. I didn't want to embarrass him. Please tell me this is NOT true. This goes against all that I have learned about firearms in the last four years of buying my first firearm. I mean, how could the bullet have rifling lines on it for LE to prove origins of spent bullets. The more I say here, the more I feel really dumb to even think he's right. Just as he swears the Army hands out rifles with bent barrels willy-nilly.