Promag Mag Extension +2 Ben M3 M1 Super 90 12Ga

The PM145 Benelli M1 Super 90 magazine extension adds two (2) 3 magnum shells or three (3) 2-3/4 shells in capacity to 12-gauge M1 Super 90 shotguns. The magazine extension is machined from solid billet T6 aluminum alloy then type III hard anodized. The spring is precision wound using Chrome-silicon wire for reliability. All steel components are black phosphated per mil-spec. identical to original factory magazine extension. Magazine extension tube clamp included. No permanent modification required. All mounting hardware included.