Briley Modular Shotgun Magazine Extension with Barrel Clamp (+4 or +6 Rounds) 12 Gauge (Beretta Auto / Benelli Pump / Franchi 912 Variomax / Stoeger)

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Price: $134.95
This extension allows you to increase the ammunition capacity of the shotgun. The extension is made of tough 6061 aluminum. This allows the tube to have a large wall thickness to improve rigidity without compromising overall weight. The tube screws down on the magazine and locks the fore end in place. The extension is supplied with a magazine tube spring

Fits: 
Benelli Nova and Super Nova
Beretta Extrema I & II, A400 Xtreme, 1301 Comp, TX4 
Franchi 912 Vairomax
Stoeger 3500, 3000, M3K