The manual for the SP1 states that there are two trigger adjustment screws. One where the the trigger guard meets the grip frame, and one near the bottom of the trigger.
I'm only seeing one; the one where the trigger guard meets the grip frame. Is there another screw or was this a typo in the manual?
I know this is old but I thought I'd offer my insight
it is near the bottom of the trigger, on the inside. to adjust that screw you need to take the trigger frame off and its on the back of the trigger itself
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If there is mine doesn't have it. Maybe it's something they added in later batches. I got about right when they came out so that could explain why i only have one point of adjustment.
The Vibe has a second screw on the trigger. I don't have an Allen screw small enough to turn it, but someone else on the forums told me that it is too short and fails to properly adjust the trigger anyway.
My stock SP-1 trigger didn't have a second trigger adjustment (for how far back the trigger could be pulled), just the at rest or how far out the trigger would travel.