Attachment skins come in five rarities: Common, Uncommon, Rare, Epic, and Legendary, and all attachments are applied with the same skin.
Attachment skins can also be applied to certain pre-existing attachments, such as the SPSMG9's integrated Reflex Sight and the P-10C's integrated Red Dot Sight.
Weapon-specific attachment skins will only apply to that weapon, but quite a few skins are universal, and can be used on any weapon's attachments. For example, the S.I. 2021 team-colored attachment skins are only available on their respective weapons, and can't be used on any other weapon. Additionally, the different colors of the S.I. 2021 skins cannot be interchanged with one another, meaning the S.I. Orange for the Vector .45 ACP can't be used on the G36C (which normally has S.I. Red), and vice versa. Inversely, skins such as the solid colors sets (Canary, Black, Crimson, etc.) are universal, and can be used on any weapon's attachments.
or Credits 
, or awarded through other means.
