My idea for random perks/mods parallels card games like hearthstone and gwent. Suppose each weapon you get has a perk loot pool, but you can influence the chances of certain perks being applied to each weapon. You begin with a "starter deck" of perks in categories like "damage dealing", "passive", "active" perks etc. Then from there you can buy new perks (like how we buy mods from the gunsmith) to add to your collection. When you have a "deck" of perks equipped, they have a higher chance of being applied randomly to every weapon you earn, in addition to every other perk in the pool. I am NOT however proposing this be applied to ALL weapons. Raids, raid lairs, iron banner, trials etc should still have fixed perks. This would solve the issue of repeat weapons, and add some much needed grind. This of course is all but the rough draft idea of a mad warlock, feedback would be highly appreciated.