Question about unique weapon

i have a question about generated unique weapon for local campaign game. for example - we searching some dungeon or pre war armour depot and in process find some stuff by random, let it be assault rifle. but not ordinarry, may be it is have one more bonus dice for one of it’s fire range, or longer fire range by one color step. may be rifle is old, so it have less bonus and so on.
the question is how to give to that item a caps cost? somebody have any idea? may be there is some formula for this?

Just use a mod, or if you want to make it a real special weapon, give it 2.

a good idea :slight_smile: but mods are not so much and still need cost for disadvantages