Where are the origin weapons?

If memory served me, when we last started, we had received an origin weapon. How or from where do I obtain this?

if you are talking about RE servers, then i think your memory doesn’t serve you properly…

on RE servers, we were getting the Origin weapon from a NPC in middle of the EGS HQ on ECC planet

for the new HWS+, you can also get the Origin weapon from a (different) NPC at Green Zone in EGS HQ on ECC