I have ordered an XDM 9mm 4.5 Bitone. I was looking at a few online while I wait for mine and started to notice some issues. Some of the pics I look at have the slide with the v-shaped grooves and the 4.5 stamped on the side of the slide. Then I keep looking and find a few with same model number but they have straight grooves like the xd and no 4.5 stamp. What is this about, im afraid I might have ordered the wrong gun.:?