Quote Originally Posted by Stuart View Post
Yes, they can own one.
Yes, they can legally buy one.
Stuart is right, but his second comment should be accompanied by more info.

THe following statements are accurate, unless some other disqualifying condition exists (felon, convicted of domestic assault, etc.).

18 - 21 can own and possess a handgun
18 - 21 can purchase a handgun from a non-FFL. FFL's are prohibited from selling to anyone under 21.

Now, it is my understanding that there is some sort of restriction on selling handgun ammunition to under 21 as well, but I don't know any details on that to speak intelligently about it.