Hyperion SMGs are highly accurate but they have the feature of "reverse recoil": the longer the accuracy increases the longer the trigger is held. The listed accuracy on the weapon is what is achievable after the sustained fire increases their accuracy to maximum.
The Transmurdera utilizes the Hyperion barrel which gives it a slightly higher accuracy at the costly price of a smaller magazine. Another trait of weapons with a Hyperion barrel are a reduced base damage, due to the gun and barrel sharing the same manufacturer.
Bitch – Legendary submachine gun with greatly increased recoil reduction rate; also have increased accuracy, magazine size and critical hit damage.
Actualizer – Seraph submachine gun with improved damage, magazine size and initial aim sway at the cost of slower reload, bullet speed and less accuracy.