This occurs with the Blaster Pistol and the Commando Pistol
I've added the lines
ScoreForMedalsType = 1
MedalsTypeToLock = 1
To the weapon files "cis_weap_inf_omm_rifle_info" and "cis_weap_inf_sup_rifle_info" (originally in common folder) and linked them to the correct odf files.
Essentially mimicking the Blaster Pistol and Commando Pistol odf's. When I get 14 kills in game with these weapons, the Frenzy award does not appear, but it does show up with the stock rifle.
EDIT: LOL nevermind. Munged again and tried in game. It works.