I have a blue version of the same gun, that says lower half, and I cannot equip it either. It showed up when I searched for gear under the rank rear admiral lower half. So it is not only a typographical error, it is classified (on the exchange anyway) as a lower half item.
EDIT: Upon looking, all XI Plasma weapons are being listed under Rear Admiral Lower Half.
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EDIT: Upon looking, all XI Plasma weapons are being listed under Rear Admiral Lower Half.