LANCER SHOTGUN EXTENSION TUBEBENELLI M1 M2 SBE SBE2 SBE3 +3FEATURES-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