One shot tactical magazine extension tube with right hand side sling mount, 12 gauge. Scattergun Technologies magazine tube extensions are so tough they were selected for use by the U.S. Secret Service and the U.S. Border Patrol. Only the strongest materials are used in constructing the magazine tube extensions to insure maximum resilience during rough usage. Each unit is shipped ready to install with our extra-power magazine spring and fully machined, neon green high-visibility follower. Features: One shot magazine extension increases magazine capacity to 5 rounds Sling mount for right hand shooter, mounts on left side Includes an extra-power magazine spring for improved reliability Includes a high-visibility follower for improved feeding and visual reference of empty magazine tube Wave washer included Follower is not grooved to fit newer 870 magazine tubes, the detent in the magazine tube may be filed down for follower fitting