New items not allowed in MTS Wanted Section

The answer is simple, guys. These items are banned from the MTS Wanted section. This is most likely to prevent: people transferring certain items to Yellonde, the pomegranate stain noobs that try to buy things like tetris pieces and Pygmy eggs when they do not exist, and maybe a few other things.

However, most of the banned weapons are still able to be listed in the buying area, this is probably, as people have stated, because there are several versions of those weapons. I'm fairly sure this is what's going on, because you can very clearly see that most of these things are being listed in the MTS sales areas constantly.