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A Duckbill choke is an attachment for shotguns that flattens the weapon's firing pattern, diverting pellets more towards the sides.Duckbill chokes saw action in the Vietnam War by US Navy SEALs, where they were reported to be very effective against groups of enemies.
— In-game description
The Duckbill changes the hipfire crosshair to a horizontal oval-shaped crosshair instead of the usual circular shape.
While not appearing by name, the Sweeper variant of the M97 Trench Gun has a muzzle attachment resembling a Dukbill. Similar to Battlefield 4, this attachment increases the spread of shotguns along the horizontal plane with less vertical spread.