Quoted: Ok clarity check for me. I'm planning on geting a USP Compact .45 in the next month or so. V1 and V9 are esentially the same, V9 has NO decocker, just fire/safe.
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That's a pretty big difference IMO, but yeah, that's the difference.
LEM is a double action only trigger, except that you have a pre-cocked striker so it isn't as heavy as a "real" double action pull. Similar concept to the glock being partially pre-cocked.
With the LEM, there is a pre-cocked striker and an external hammer that rests down. You pull the trigger to make the hammer do its thing. If you do it on an empty chamber or a bad round, your next trigger pull (assuming you don't tap/rack/bang) will be a "real" double action pull (read: much heavier.)
It's a cool idea, but I just didn't like it and sold my LEM P2k.