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Hi Jimmy, Federal law prohibits us from increasing the magazine capacity on our Benelli M4 shotguns from 5 rounds to any more than 5 rounds. However, there is a way around this, as defined by federal law and the ATF. How we achieve this is as follows: You must replace a total of three imported parts on the Benelli M4 with American made parts in order to increase the capacity of the magazine. You can replace 3 of the following parts - Receiver Barrel Bolt Bolt carrier Gas piston Trigger housing*^ (Choose from: M4 922r A&S Black, M4 922r A&S NP3) Trigger*^ (FFT USA Made 922r Compliant Trigger Kit) Hammer*^ (FFT USA Made 922r Compliant Trigger Kit) Disconnector*^ (FFT USA Made 922r Compliant Trigger Kit) Buttstock (with integral pistol grip)*^ (Mesa Tactical USA Made 922r M4 Stocks) Forearm/handguard (forend)*^ (Choose from: FFT USA Made 922r Compliant Forend, Mesa Tactical 922r Truckee Forend in
Hi Jimmy and welcome. The +2-magazine extension can be added no issue on the Military Armament MAC 1014 12ga. Cheers, stay safe and enjoy! Tube extension installation is the same as the Benelli: https://www.youtube.com/watch?v=N7smmmngylA&t=24s