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A Modified Choke is a choke that is 0.020 inches smaller in diameter than the bore of the shotgun barrel, tightening the shot and improving accuracy at moderate ranges.
— Battlelog description
The Modified Choke is a weapon attachment featured in Battlefield 4. It moderately tightens the spread of buckshot or flechettes and, as a result, improves the ADS accuracy of a shotgun over the standard barrel, but not as much as the Full Choke.
As with any shotgun choke, the Modified Choke adds an increase to recoil and worsens hipfire accuracy, but not to the extent of the Full Choke, allowing hipfire to remain viable in closer engagements.