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Hi Adan and welcome. It is 6.25 inches long. Two Shot Magazine Extension Increases Magazine Capacity to 6 Rounds Includes an Extra-Power Magazine Spring for Improved Reliability Includes a High-Visibility Follower for Improved Feeding and Visual Reference of Empty Magazine Tube Fits Remington M870 | 1100 | 1187 - 12 Gauge Wave Washer Included Parkerized Finish Follower is not grooved to fit newer 870 magazine tubes. The detent in the magazine tube may be filed down for follower fitting. Cheers and stay safe!