If the item is special in some way (a select few mission rewards, a weapon from a ship pack, reputation gear) it has a static/fixed mod at ultra rare. Outside of that collection of special items, any gear that gets upgraded can only gain one of a select few standard modifiers. In the case of weapons you are looking at [Acc], [CrtD], [CrtH] & [Dmg] modifiers.
If you want some special modifier, you must craft it, and it can only get the special modifier when crafted (still restricted to the standard modifiers when upgrading).
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So I just need to upgrade one to find out if [arc] will happen.
If the item is special in some way (a select few mission rewards, a weapon from a ship pack, reputation gear) it has a static/fixed mod at ultra rare. Outside of that collection of special items, any gear that gets upgraded can only gain one of a select few standard modifiers. In the case of weapons you are looking at [Acc], [CrtD], [CrtH] & [Dmg] modifiers.
If you want some special modifier, you must craft it, and it can only get the special modifier when crafted (still restricted to the standard modifiers when upgrading).
Now I'm curious... but it seems likely that these would get a regular mod.
My character Tsin'xing