Picked this used USP up the other day. (V1 variant) I liked everything I read about it's reliability, and even though I had a P30 and a VP9 at one time, I had never shot or held a USP before. I added the target trigger , hammer, and hammer spring. This improved the DA trigger pull noticeably and made for a better all around trigger. Took some video help to get it back together but after a hundred trouble free rounds today, I can say that every thing worked like it was suppose to do. I enjoyed shooting it and may just keep the old girl around.