The A400 Xtreme Unico is comfort, power and reliability at the highest level. Perfect for any type of hunting, it shoots all the 12-gauge ammunition, from 24 to 64 grams. The best strength and corrosion-resistance are combined with the maximum shooting comfort thanks to the Kick Off and Kick Off Mega systems, a series of hydraulic dumpers and dampeners that reduce recoil and muzzle jump to the lowest terms. Beretta's gas-operated system utilizes a rotating bolt head for reliable speed and unbeatable performance. Aqua Technology's exclusive corrosion-proof barrier, and Beretta's proprietary Steelium deep drilled, cold hammered, and vacuum extended barrels provide the basis for the Xtreme's never quit, show no mercy attitude and allow it to reign supreme in the most extreme conditions imaginable. Optima Bore HP full, modified, and improved cylinder choke tubes included.