I don't care what they say, and even if it's completely legal. I wouldn't advice anyone to. If you're not old enough to buy it, then logic says that you shouldn't be old enough to carry it around. Much like the analogy given earlier, that's like walking around with a beer in your hand when you're not 21 and then just saying, "well, I didn't buy it. My buddy who is 21 bought it for me...." What would you get then? What would HE get then? Same logic should apply here IMO.
Again, it may be perfectly legal, but my personal opinion and advice would be NOT to carry it outside your house. It's only asking for head aches.
