In 1994 the federal government had a ban on certain weapons that could carry more that 10 rounds. It expired in 2004. The manufacturer of this particular weapon had to stop manufacturing until the ban was lifted because of the capacity of the magazines. This model was manufactured pre 1994 so hence "preban".
im fully aware of clintons sunset clause of 1994. just ribbin you. but no one cares about it being preban. it matters not in this state. now if you were listing in california, or some other state that can only have "preban" weapons. again here nobody cares.