I was reading the info on the different HK pistols as according to HKPro.com and I was reading up on the USP Tactical models ( as I have just newely aquired one) and I was surprised to see that the 9mm was said to not have an "O" ring, nor match trigger? Does the same go for the .40??? Also it didn't mention a .40 caliber as a model in "tactical". Is this a newer USP model? When I went to purchase the gun at the my local gun shop, the .40 stated "tactical" on the slide so I know I am not being jipped! What gives? How come no info the USP tactical .40, not even on the official website?