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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.
"Spreads pellets horizontally suppressing and damaging more targets in a wider cone."
— In-game description
Battlefield 4 includes the Duckbill as one of several optional chokes for shotguns.
The Duckbill, as the description suggests, causes pellets or flechettes to have greater spread along the horizontal plane, with less vertical spread.
It has no effect on single projectiles such as 12 Gauge Frag and 12 Gauge Slugs.
The Duckbill changes the hipfire crosshair to a horizontal oval-shaped crosshair instead of the usual circular shape.
The Duckbill is a weapon attachment featured in Battlefield 1. Similar to Battlefield 4, the attachment increases the spread of shotguns along the horizontal plane with less vertical spread.