Benelli M1/M2 4-Shot Magazine Extension Kit 12 Gauge

GG&G INC +3 Mag Extension fits Benelli M2 Black

Carlson's Shotgun Magazine Extension for Benelli M1, M2, Super Black Eagle, Super Black Eagle II 12 Gauge 8-Round

Carlson's Shotgun Magazine Extension for Benelli M4 12 Gauge 7-Round

Lancer Systems LSX Extended Shotgun Magazine Tube for Benelli Shotguns - 9-Round

Carlson's Choke Tubes Magazine Extension Assembly 20 Gauge Benelli M1/M2/Franchi 8-Round Black 8RD

PW Arms Panzer Extension Tube Benelli M4 12 Gauge 7-Round Parkerized

Briley 12 Gauge Shotgun Magazine Extension - Beretta Auto, Benelli Pump, Franchi 912 Variomax, Stoeger