Velium Threaded Bow has 371 AC, while the other range items (Velium Threaded Idols) all have 417 AC. In TOV, the Velium Infused Bow has 339 AC, while the other range items (Velium Idol) all have 319 AC. The Velium Threaded Bow should have 437 AC (or there about).
Actually that is not necessarily true, it might be an error on the other range items which should have lower ac like 351 instead of 417..... Do not assume that the best item is always the correct one, it might be the worst that is the correct, and then the best will be made worse due to posting a bug about it.
Let's look at the older items. I don't have the stats for the ROS tradeskill stuff, but at least for the past 3 expansions, the bows have consistently had higher AC than the equivalent regular range item. TOV raid T1 - Bow 422 Range item 398 TOV raid T2 (tradeskill) - Bow 436 Range item 410 TOV group T1 - 315/296 TOV group T2 - 323/309 TOV group T3 (tradeskill) - 339 / 319 TBL raid T1 - 364/342 TBL raid T2 (tradeskill) - 393/370 TBL group T1 - 236/229 TBL group T2 - 273/260 TBL group T3 (tradeskill) - 306 /288 TBL group T4 (GMM) - 309/290 ROS raid T1 - 312/294 ROS group T1 - 204/200 ROS gorup T2 - 214/202
Velium Threaded Arcane Staff has the same problem The AC on the Velium Threaded Arcane staff is lower than the previous ToV/T3 (2h) appears to be the same as the 1 hand CoV/T3 Velium Threaded Wand at 290. This is also around 150 less than comparable priest T3 Velium Threaded Halberd at 440 AC.
