Quoted from "Battlefield Blog"

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Today, you can download the Physical Warfare Pack for Battlefield 3 on PlayStation 3. This pack is available now at no extra charge on the PlayStation Store for all players.

Physical Warfare Pack grants you instant access to the powerful DAO-12 shotgun, if you haven’t unlocked it already. It also features custom flechette ammo for the DAO-12, a flash suppressor for the SKS sniper rifle, plus the Type 88 Light Machine Gun.

This pack was previously only available as an exclusive pre-order item. Now we are making this available to all Battlefield 3 players at no extra charge. PlayStation 3 players can get it today, while PC and Xbox 360 players will be able to get it at a later date. We will let you know as soon as it is available on all formats.

Now go grab your new hardware and take them to the battlefield!