Mida with the changed catalyst will dominate.
Its only current flaw is getting flinched.
Other build options iam thinking of is pairing the new sidearm with a proxynade grenade launcher. A proxy nade hits for (optimal detonation) 170+ then swapping to the sidearm for a quick clean up(if its a 300rpm or 260rpm doesnt matter both do enough body and headshotdamage up until 15+-m to clean up).
If the trigger for the freeze shot is a kill this will allow for a nasty synergy. Since a frozen target gets 1 shot by the proxynade GL that normally only weakens them.
I love using GL's in pvp.
(Not a native english speaker sorry if i made mistakes.)