Board Thread:Game Discussion/@comment-10287686-20131226001605/@comment-11482499-20131226034926

It's because the 2nd Alpha sig weapon is in points rewards.

Note there is only ONE Orion Pax weapon in points rewards as a result, not the usual 2 Hard boss weapons. And no way to buy more OrPax weapons. So if you want a full set, 1 is the most you can get. Any extra OPs will just have to make do with non-sig weapons.