Increase your magazine capacity to 6 rounds with the Wilson Combat® Two Shot Vertical 12 Gauge Remington M870/1100/11-87 2-Round Magazine Extension. This magazine extension features an extra-power magazine spring for reliability and a high-visibility follower to offer a visual reference for the empty magazine tube. Wilson Combat Two Shot Vertical 12 Gauge Remington M870/1100/11-87 2-Round Magazine Extension - Shooting Supplies And Accessories at Academy Sports