Upgrades and Addons

Upgrades and addons go into the special slots of a turret base (tier 2 and higher) and affect every turret on that base. Their tooltips say which machine they fit into.

Base tier	Addon slots	Upgrade slots
1	–	–
2–4	2	1
5	2	2

Upgrades

Each upgrade slot holds up to 4 upgrades of one kind. The bonus per upgrade is set per turret in the Configuration; the defaults below apply to nearly all turrets.

Upgrade	Effect per upgrade (default)	Formula
Range	+2 blocks	baseRange + rangeUpgrade × n
Fire Rate	+10 % shots	ticks between shots = baseFireRate / (1 + fireRateUpgrade × n)
Accuracy	+20 % accuracy	inaccuracy = base / (1 + accuracyUpgrade × n)^1.5
Efficiency	−8 % energy per shot	energy = powerUsage × (1 − efficiencyUpgrade × n)
Scatter Shot	+1 projectile or ray per shot	see below
Creative	fills the base's energy storage and turrets use no ammo	creative only

Scatter Shot: with n upgrades every shot fires 1 + n projectiles (or rays), uses 1 + n ammo items and (1 + n) times the energy, and inaccuracy grows by 10 % per upgrade. The Rail Gun, Melee, Slowing and Teleporter turrets ignore Scatter Shot upgrades completely.

The Energy Multiplier upgrade belongs to the Generator, not to turret bases.

Addons

Addon	Per slot	Effect
Damage Boost	4	each one adds a share of the target's health as extra damage per hit (default 5–10 % depending on the turret)
Fake Drops	4	mobs killed by turrets drop loot as if a player killed them; each additional addon adds one level of Looting. Without it, turret kills drop no loot.
Recycler	1	per shot, a chance (default 10 %) to use no ammo and a chance (default 5 %) to generate ammo
Solar Panel	1	generates 10 RF/t in sunlight
Redstone Reactor	1	burns redstone dust (1,600 RF) or redstone blocks (14,400 RF) from the ammo slots when the energy fits into the base
Turret Concealer	1	turrets retract into the base while they are not shooting
Serial Port (1.12.2 only)	1	lets OpenComputers and ComputerCraft control the base (tier 5 bases do not need it), see OC CC Functions