How do you unlock SPAS-12 in Battlefield 3

In Battlefield 3 online multiplayer, the player can unlock weapons by gaining points. The SPAS-12 is a pump action shotgun that is featured in the "Close Quaters" expansion. It is unlocked by completing the "These Hurt Too" assignment. This assignment requires the player to get:

• 20 kills with Pistols
• 20 kills with Shotguns