I am looking to buy a USP .45, possibly used. The one I am looking at says it was purchased in 2009. V1. Has anything changed since then with this model? Also, anything I should know or look for? Supposedly has less than 500 rounds. Also, am I correct with the V1, V2, V3 etc, is just the configuration ie. DA/SA with safety..... Thanks! Thanks for any help anyone can provide. Just want to make sure I make an informed decision... Wanna kill these ads? We can help!