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The Nordic Components MXT 12GA Shotgun Magazine Extension Tube +4 Kit (MXT-TBS-12-4K) increases the existing shotgun capacity and from 6061 aluminum that is anodized. Used in conjunction with the MXT extension tube nut, this tube kit will add the stated number of rounds (+1 to +9) to your existing magazine capacity. All capacities are measured using 2.75″ star-crimped shells; for use with 3″ or 3.5″, increase your selection by one or two rounds.
Note: Requires an MXT extension tube nut to be installed on your shotgun (NOT Included).