12 Gauge Flechette

Flechette Ammunition is a special type of ammunition that uses small pointed steel projectiles that act like small darts. Flechettes can be used in a single round as a discarding sabot, or they can be grouped together in artillery weapons or shotgun rounds for anti-personnel use.

Battlefield 3
In Battlefield 3, Flechette Ammunition is a special pre-order bonus that is a part of the "Physical Warfare Pack", a special offer to those who live in the United Kingdom. It is available for use in the exclusive DAO-12 shotgun that comes as a bonus in the pack as well. The rounds are stated to have increased penetration capabilities for shotguns, allowing a user to easily penetrate light cover and even other players. It is likely that the ammunition will be available to be unlocked once the game is released and that it can be used in other shotguns, but those who are fortunate enough to have this bonus will have it from the start online.