Most USP's come as Variant # 1. For ipsc production, I recommend either the variant # 3 for lefty, or Variant # 4 for righty. I say this because I find the decocker to get in the way of my thumbs (right handed, thumbs on left side) if you had a variant # 3. OR, if you use a .40 or .45 in standard division, I would recommend Variant # 9 (righty), cocked and locked or Variant # 10 (lefty)
You only need a small metal plate change to go from variant # 1 to any variant with the lever on the same side. probably about $15 for the part (the control lever plate)