Dont know if anyone has already done this, but if you save your game with the Particle Rifle equipped, and open that save with Gibbed's Save Editor, you can see its called:
SFXGameContentDLC_HEN_PR.SFXWeapon_AssaultRifle_Prothean
Dont know if that actually helps any. Im looking for it now, but so far dont see it anywhere, so it may remain uneditable, unless someone figures out how to edit DLC, which I dont think was even able to be done in the previous ones. I could be wrong though.
All of my DLC was modified in ME2. I haven't looked into it for this game yet.
to get any armor/casual change plotflag to -1 and u will have them from start
Thank you That said, I'm looking for the weapon, and I'm not sure where to find it. Running a search on Saber brings a few things up, but I never saw a plotflag thing.