They're not going to sell weapons in the AC shop, there's some features in the AC shop, like extra character slots, extra mags, extra skill trees, a clothing lottery, and other stuff.But it makes sense, they need all the people they can get to buy weapons.
Here's a bunch of guides for the game:Ugh, you're probably right...Need a translation guide STAT.
http://bumped.org/psublog/pso2-guide-list/