User blog:Awyman13/BF4 Confirmed & Speculated Weapons

While we know of most of the weapons to be in the game, not all are known or confirmed. The recent Battelog trailer showed some new weapons like the SAR-21. It also showed the M14A3 (which doesnt actually exist) as well as the M16A3. While the M14 could be a typo for the M16 then why would their weapon icons be noticeably different?