I didn't bother with it on my Whisper.
That being said, please keep it specific to the Mag and not the first shot in order to keep the Ikelos Sniper (and future weapon rolls) relevant.
If that won't work on the Whisper, then so be it. Whisper was, as it were, a GRIND. Anyone who earned it deserves it. I couldn't. >:[
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If they didn’t, they would just make bosses have more health. Hurting those who either don’t have it or want to use something else.