correct. the ST identifier stands for "soft touch" referring to the bolt. The way to tell which bolt you have, simply look at the bolt face. The ST bolts will have a clear-ish or red-ish clear rubber button mounted on the face of the bolt in a milled recess. This is to help prevent ball breakage from being hit by a solid metal bolt.
I'll see if i can get some pics up for you tonight if my T9 made it back from Tiberius today.