Actually the Beretta & Benelli (known as the H&K) are pretty much one and the same. The main difference is that the H&K model's barrel, mag tube are different, in that the Beretta is longer and can not be extended, but the H&K can be extended. The H&K bbl and mag tube setup will fit the Beretta.
In the hands of a pro these shotguns can fire so fast, that before the first empty shell casing hits the deck the weapon can be emptied of seven rounds.
Use 00 or 000 buck and it makes for overwhelming firepower, but beware, while these weapons do function flawlessly with all loads and without any gas system or adjustments, they kick like a mule. This can be reduced with accessories from Brownells in Iowa.
Teflon the weapon, use the stainless recoil system, and you have a weapon that will last many generations, under the most adverse conditions, and function flawlessly too!
NOTE The barrel bore, carrier, and bolt are hard chromed already!