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Kallim

Yes, there are some skins that do give you a competitive advantage, like the st. Patrick's Day skins have proven to get smaller in-game, which makes it harder to hit the player. If you want them, check this source unlock trials of osiris

Cliffordss

I prefer to level up by buying new weapons. A couple of days ago, I bought myself a shotgun https://truecost.gg/cod_vanguard/item/shotguns_diamond_camo_unlock. If you also want to get gold and diamond camouflage for a shotgun, go to the website and get a discount.