Midwest Gun Works offers a wide variety of Stocks and Forearms for the Beretta 391 Shotgun enthusiast. Please browse the products below and if you don't see the item you're looking for, keep checking back. We add to our inventory daily!! Special Note: Beretta 391 Urika Stocks and Forearms also fit the Urika 2 Shotguns. Xtrema, Xtrema 2 and Urika Buttstocks are interchangeable. 391 Forends must be ordered specifically for the type of choke you have. Mobilchoke forearms will not work on Optima Barrels and vice versa.