Old-style Hyperion's SMGs have higher damage output at the cost of significantly lower accuracy and fire rate than their modern analogs. They also have a limited version of Hyperion's "reverse recoil" when aimed down the sights only.
The Pro-Target utilizes the Hyperion barrel which gives it a slightly higher accuracy at the costly price of a smaller magazine and reduced base damage.
In addition to the Pro-Target, a variant of this weapon exists as the Transmurdera, made by the "new" Hyperion.
This weapon is only comes in green or higher rarity.
The Pro-Target is obtained randomly from any suitable loot source.