Descripton: Sure Cycle Tactical System for older Benelli SBE, M1 Super 90 & Montefeltro shotguns. This system is designed to deliver maximum performance from your shotgun when using magnum loads. It WILL NOT function properly with light target loads. High velocity target loads, such as AA Super Sport or Nitro 27, WILL function with the BNL-03 system. Fits: Benelli SBE shotguns with serial numbers lower than 185000. Benelli M1 Super 90 shotguns with serial numbers lower than 470000. This system has 19mm threads. All factory systems with 19mm threads are manufactured from steel. Please check the factory tube before ordering. Improve the performance and reliability of your Semi-Auto Shotgun with the Sure Cycle System. Total stainless steel recoil spring system solves cycling problems caused by recoil system rust and corrosion; completely impervious to salt water, humidity and rain. Precision machined to exacting tolerances; reliably cycles all loads, including magnum and light target loads. Provides an increase in the cyclic rate that lets you get those second and third shots off quickly. Operates dry; requires no lubes or oils that can harden and slow down action in cold weather. Installs easily without modifications to gun.