My roll on the hand cannon is One-Two Punch and Threat Remover (which also procs at the same time), and you only see Threat Remover on the HUD where you should also be seeing One-Two Punch.
[b]This matters because you can't tell when your One-Two Punch is about to run out (3sec).[/b]
Even though the activation requirements are the same, not seeing both actually does cause issues for this reason.
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I'm not seeing it for shotguns either