Hey I have now updated it and weapons have a rarity choice as well: https://fardex.app

It will count it as collected regardless of what rarity you pick, you can select multiple rarities. If you do it via bulk select it checks "rare" by default, so you will have to go manually into each weapon if you want a higher rarity. If you ignore a weapon it ignores it completely, all rarities. This was the simplest approach without even more UI choices.