@Camgibbler - found the info:
If you've a later model ATR - the trigger is adjustable from factory per here:
https://www.youtube.com/watch?v=CnfnbXwiklI
If you've one of the earlier ones like me, its a bit of work per here:
Mossberg ATR100 & 4X4 Trigger Fix w/Pictures | Rifles, Shotguns & Handguns | Texas Hunting Forum
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