I imagine Zen Moment is triggered only once, even with Explosive Rounds. If you take one with ERs and Outlaw, then precision kill something but the explosion technically kills them, it doesn't trigger Outlaw. It also doesn't trigger Firefly for that matter, which should negate Firefly if you get a 3HKO to the head. I think it's the same with all perks.
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Thanks, think I'll keep these perks, it looks like it will be a fun weapon, so I may still use it occasionally even if I get VoC. Going to re-roll the lash, the Return to Sender perk isn't as good as I hoped, with only 25% chance it will add another round or two in PvE ... that's not going to tempt me to switch to it. I'll look for PvP perks instead.