It is manufactured by Benelli Armi SpA of Italy.

It employs a semi-automatic fixed barrel operation using the inertial, blow-back system.

The feed is through sequential loading with a 5 or 6-round magazine depending upon the caliber.

The trigger guard is made of a special alloy of anodised ergal 55 aluminium, while the trigger mechanism is made from molybdenum chrome-nickel, heat treated and chromed.

The following table shows the major results achieved by shooters using the Benelli MP90S cal.