Lancer shotgun extension tube benelli m1/m2/sbe/sbe2 plus3 FEATURES-Designed to attach to existing shotgun magazine tubes to provide added capacity to the shotgun-Machined aluminum components combined with a lightweight carbon-fiber tube-Creates a lightweight, durable extension to your shotgun-An extra-long spring is included that can be cut to optimize loading-Extension clamps are recommended for extension tubes that extend beyond the end of the barrel-The LSX-3X adds three rounds to magazine's capacity Other Features: Extra long spring included that needs cut to length, plus 3 rounds, length 9.4"