Its harder to use an assault weapon to hit something than it is a shotgun." - Joe Biden Biden on self-defense: ?Get yourself a shotgun? | The Ticket - Yahoo! News Most people will score COM hits more readily and consistently with a lightweight, carbine- length AR-15 w/ an adjustable stock and red dot optics. That is why the AR-15 or other semi-auto 5.56 carbine has replaced the shotgun in police cruisers around the nation.