Attachments can be gained by using Weapon Upgrade Kits; up to four can be attached to a single weapon.
Using a Weapon Upgrade Kit gives a choice of 3 or more randomly-selected Attachments for the currently equipped weapon, along with a small boost to its damage (+5%). Attachments with a gold color are rare attachments, which have a low chance to appear as an additional choice in the given selection.
15% chance to not consume ammo in the magazine.
Increases the maximum amount of spare ammo by 40% and grants slightly faster ejection speed. Also increases ammo gain for the weapon by 20%.
Prints spare ammo (15% of magazine size) for every 50 heat generated, scaling with magazine size. Production then consumes 10 heat.
Losing shields (or health if no shield) grants ammo regeneration for a duration. Multiple instances can stack.
Bullets are directed towards the recoil center, and increasing overall accuracy and precision.
Bullets always ricochet from surfaces or gain one additional bounce. Increases armor penetration.
Adds an aiming laser. Grants movement stabilization and passively reduces weapon deviation.
Converts semi-auto to full-auto, or full-auto/burst-fire to semi-auto.
Adds full bullet enemy penetration or increases penetration damage. Increases bullet velocity.
Increases damage to structures and propers, and reduces enemy health regeneration by 50%.
Last shot in the magazine deals increased damage and inflicts either stun or burn (for each projectile); damage scales with magazine size.
Increases damage by 15%, but also increases deviation by 3° and recoil by 10%.
Offload Cycler Ultra
Burst fire weapons: Fully removes burst delay.
Sem/Full-Auto weapons: Reduces delay between shots.
Power Link 4x4 Pin
Grants a random bonus for a few seconds on successful active reload.
Kills reduce running cooldowns for items by 1 second and slightly decreases weapon deviation.
On ejecting, vent heat and return unspent ammunition to reserve. Passively reduces heat generation.
Short Magazine Spring
Increases magazine capacity. Can only be reloaded when empty.
Silver Bullet Alloy
Increases damage against Elite enemies and Bosses by 2% for each 100 maximum health and bullets take down one additional plating.
Reduces recoil when standing still, but no effect whilst moving. Passively reduces weapon recoil in addition.
Removes damage falloff over distance or increases distance damage increase. Increases maximum travel distance.
12% chance to fire an extra projectile at no ammo cost.
Vital Data Collector
Every 4 kills grants +25 max health, until +400 max health has been gained.
Ammo TP MkII
20% chance to not consume ammo in the magazine.
Cranial Targeting CPU
Deal 100% increased headshot damage but lose 30% damage overall, powering the device costs 10 shields per shot.
Converts the weapon for run-and-gun use, strongly increasing deviation, movement stability, and damage.
Replaces vital weapon parts with a heavy Eternium metal mixture, strongly increasing weapon performance but reduces movement speed nearly to a halt when held.
Enemies killed whilst holding the weapon spawn red orbs that each grant 2 ammo directly to the non-empty magazine, 50 shield, and 5 heat.
Unlocks all ammo types for all weapons and allows switching of ammo types without ejecting first. Switching ammo types generates 15 heat.
Super Heavy Compound
Bullets are extremely heavy, deal 40% more damage but slightly reduce movement speed and have 30% reduced range with strong damage falloff over distance.
Decreases firerate and damage by 30% but fires 2 additional pellets per shot while tripling ammo cost. Increases minimum heat by 10.
40% chance to gain double ammo from pickups. Switches the weapon to a rapid fire 5-round burst. Burst weapons gain 3 extra shots per burst.
Kills grant permanent +0.25 luck, stacking up to 400 times. 5% chance to deal 200% damage, can crit.
Increases magazine size by 30%. Projectile hits return 1 ammo directly to spare ammo, while misses consume 1 additional ammo in the magazine after a short delay.
The digital screen on the Digitalizer upgrade displays the word 'SHRIKE', the screen name of one of the developers.