This is for the Adapted Honer and M.A.C.O Weapon The Borg appear to not adapt to the weapon fire. You need to add for the Borg Prosthetic Auto adapt Frequency Remodulator for the borg not 15 dmg vs borg, you cant get 2 ore 3 volley before the they adapt ore more time for the adaption to the borg.
The Borg do adapt to the Ground Set weapons (Adapted Honor Guard/MACO, MACO and Omega). A complete ground set offers the Internal Frequency Remodulator, offering an instant remodulation every 10 seconds if a weapon gets adapted to. In addition, You can choose the Rotating Weapon Frequency from the Omega Reputation system at Tier 3 to slow down the adaption process on any weapon.
That being said: I do not like any of the Borg prothesis weapons as their high rate of fire (and that of Auto-Carbines, Auto-Rifles and Miniguns) seems to make the Borg adapt to them more quickly. Go with a Pulsewave and the MACO set weapon - or the Honor Guard/Adapted MACO weapon and a Split beam and You should note some difference.