It reduces the reach to the trigger. I've only seen them for DAO and DA/SA handguns, like classic P-Series. I have one on my SP2022. Not sure what it does for a 320 since this is the "only" model to boast such. If you try to search on P320 short reach trigger, you only find links to the AXG Classic, other P-Series (not 320 or 365), and even short reset triggers (the other SRT). I could find no parts listing for it.
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