The M4 Charging Handle is specifically designed, manufactured and tested for the Benelli M4 shotgun. The Benelli Tactical Charging Handle is much larger than the factory Benelli M4 charging handle providing a more positive method of charging, especially in stress fire situations. Heavy knurling reduces the chance of your fingers or hand slipping off the charging handle during stress or when wearing gloves. RSR - MWMCTAR-21G2