One is enough. – ×3.5 critical damage when aiming down sights (no bonus when hip firing). Extremely high weapon zoom. Increased weapon accuracy, handling, and reload speed. Reduced base damage.
Usage & Description
The Monocle is designed to be used as a long range precision weapon, as its extremely high zoom makes it difficult to use otherwise. Its zoomed-in critical boost makes it excellent for this purpose, although non-critical hits are penalized by its low damage. It also cannot be used for hip-firing as it does not gain a crit boost while unscoped.
FL4K's Fade Away synergises worse with this weapon than what might be expected: Although "Critical!" pops up on any Fade Away hit, the damage bonus of the weapon is only applied when striking the actual critical spot.