M3 Magazine Extension Kit - M3 2 Shot Magazine Extension Kit

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 SuperNova, Beretta Extrema I, II, CZ 712, 912 12 Gauge 7-Round

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

Briley 2-Piece Bolt Operating Handle Fits Benelli M2/Benelli M3, Black

BENELLI 4 Shot Magazine Extension Kit for M1/M2 Shotguns

BENELLI QP Only M4 Magext Kit 2 Shot LE

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