Hop-Up

Hop-Up attachments are special weapon attachments that greatly impact the weapon's performance. Weapons can only equip one at a time, except for the Bocek Compound Bow, which can equip two at once. The available hop-ups change every season.

Anvil Receiver

 * Valid for the VK-47 Flatline and the R-301 Carbine.

The hop-up increases semi-auto damage, but the single fire uses 2 ammo per shot while the rate of fire is reduced. The single-fire damage multiplier is 2.5x for the R-301 Carbine and 2.25x for the VK-47 Flatline.

Deadeye's Tempo
The hop-up speeds up the rate of fire when continuously firing after timing a shot properly.
 * Valid for the Bocek Compound Bow and the Sentinel.

Disruptor Rounds

 * Was valid for the Alternator SMG and the RE-45 Auto.

Removed in, increased damage to shielded targets. The damage multiplier differed with each weapon: the Alternator had a multiplier of 1.55x and the RE-45 Auto had a multiplier of 1.7x.

Double Tap Trigger

 * Was valid for the G7 Scout and the EVA-8 Auto.

Removed in, the hop-up granted an alternative burst fire mode. As the name suggests, two shots were fired per trigger pull.

Hammerpoint Rounds

 * Was valid for the P2020 and the Mozambique Shotgun.

Removed in, the hop-up greatly increased damage to unshielded targets: 2.35x for the P2020 and 2.26x for the Mozambique.

If damage transitions from shield to flesh, it breaks the shield, and any further damage to health is affected by the Hammerpoint multiplier.

$$finalDamage = max(0,damage-shieldHealth) \times hammerpointMultiplier + min(damage,shieldHealth)$$

Precision Choke

 * Was valid for the Peacekeeper and the Triple Take.

Removed in, the hop-up greatly reduces the gun's spread by aiming down sights, up to three levels. The Triple Take stays charged for a little bit and slowly loses the precision after the player stops aiming down sights while the Peacekeeper loses the charge way quicker after leaving ADS.

Quickdraw Holster
The hop-up reduces the weapon's swap time, ADS time, and hip-fire spread.
 * Valid for the Wingman and the RE-45 Auto.

Selectfire Receiver

 * Was valid for the HAVOC Rifle and the Prowler Burst PDW.

Removed in, hop-up grants an alternative fire mode: It allowed the Prowler to fire full-auto and the HAVOC to fire a single hit-scan laser.

The hop-up is now integrated into the Prowler and can be toggled between burst and full-auto by using the fire-select button.

Shatter Caps
The hop-up splits the weapon's arrow or round into a shotgun pattern.
 * Valid for the Bocek Compound Bow and the 30-30 Repeater.

Turbocharger

 * Valid for the Devotion LMG and the HAVOC Rifle.

The hop-up removes the need for the weapons to charge up; either it removes the delay to fire or it instantly increases a weapon's rate of fire so it reaches the maximum much faster.

Skullpiercer Rifling

 * Was valid for the Longbow DMR and the Wingman.

Removed in, the hop-up increased the weapon's headshot multiplier: the Wingman from 2.0x to 2.25x and the Longbow from 2.0x to 2.5x.

Graffiti Mod

 * Was valid for the M600 Spitfire.

Available during the Always Be Closing Evolved game mode to tease and Rampart, the  increases magazine size by 15% and reload speed by 25%, also it allows paint-loaded rounds. The paint colors can be yellow, green, or purple.

Trivia

 * The hop-up is built into the Peacekeeper and Triple Take after its removal in.
 * The hop-up is built into the Prowler Burst PDW (but not the HAVOC Rifle) after its removal in.
 * The hop-Up was accidentally leaked early in the first Hunt of "The Broken Ghost" quest, where it spawned in one of the loot bins.