This schematic is acquired in the Geonosian Bio Lab on Yavin IV by talking to the Npc which is guarded by a few Enhanced Klikniks. Talk to the npc, once you're finished conversing with him/her, a Geonosian Tenloss DXR-6 Disruptor Rifle schematic will appear in your inventory. Edit: Loot from Crazed Goenosians