This is the main production variant; the others stem off of this design with slight body differences. However the internal mechanisms are the same.HD stands for Special Defence And Security Shotgun and is aimed for security personnel.

The receiver is manufactured from Ergal 55 alloy which makes for a lightweight shotgun at only 3 kg., light compared to many other tactical shotguns such as the Franchi SPAS-12 which weighs close to 5 kg.

The bolt is locked into place by a piece of aluminum which swings into place and engages a notch in the barrel extension to lock the bolt to the barrel. This prevents a misfire from dropping as it acts as a crude safety device. Misfires from dropping are common in shotguns such as double-barreled shotguns.

The HD has an under-barrel tubular magazine like many other semi-automatic shotguns and holds 7 cartridges plus 1 in the chamber giving a total capacity of 8.

The stock is made from a composite polymer which is the most changed structural feature among the different HD variants. Common changes to the stock include shortening, addition of a pistol grip and changing the material of the stock altogether like in the HD Trainer.

A variety of sights can be placed on the above the receiver such as. As well as sights, tactical lights and laser pointers can also be placed on this rail.