Assuming that you have a pre- 09 Atr, the trigger is unadjustable... And you can't get a replacement from mossberg. The trigger pulls on the ATRs are horrible, ranging from 3.5(good) to 8.5(horrible) lbs. Mine breaks at 8 pounds, and there is no way of adjusting it. Believe me, I've tried, and so have gunsmiths.
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