First of all, thank you for your service to our great country. For your first HK pistol, you made an excellent choice. I think the USP series is the best modern handgun on the market, despite being twenty five years old. Even though you have your full size 9mm tricked out, I suggest you try a 9mm Expert. Has the match trigger and is super accurate and reliable, but does not have the threaded barrel like the USP 9 SD. Thank you again for your service.