I just got a HK 45 USP compact in a trade and do not know anything about it. I have never owned or looked at anything HK. It came with a bag of trigger parts and another bag from HK parts.com with instructions for installing a LEM trigger system. How do I figure out what has been done to the gun and what trigger system is in it? The trigger is nice but heavy for my liking in DA and SA. I still haven't decided if I am going to keep it or not... FWIW, it came with the original barrel, the HK threaded bbl, 3 mags, and all paperwork, as well as the original (I assume) trigger components and Trijicon night sights installed + original HK sights. What does the GT brain trust think it is worth in 95%+ cosmetic condition?