I believe this item is gained from assault. Found in zone Periqia. Mission name is "Diffuse The Threat". Also it is appraised from a "??? Necklace". Its a very rare appraisal though.
Hence why it would be a RNG piece and not a THF piece... and further, how would this, in any way, help Trick Attack? IF you owned this for THF, which I can't imagine why you would unless you REALLY wanted to spam bolts, why in the world would you keep it on while using TA? Two words: Equipment macro.