The 8x Scope is an attachment in Islands of Nyne that can be used to modify your weapons for additional bonuses.
Just like the 6x Scope, the 8x is only available to the Sako-85 Sniper Rifle. It is functionally identical to the 6x in every regard other than magnification. It is a incredibly rare spawn in the world and can frequently be found inside Beam Drops, along with the Sako-85 Elite, where it will benefit greatly from the Elite variant's improved handling characteristics. Aesthetically, it's coloured blue, as opposed to red, to indicate it's rarity just like the other Elite weapons/items.