A cybernetic prosthesis for a missing hand, arm, foot, leg, or eye can be purchased for 1500 credits and installed with 1 hour of surgery (at a cost of 500 credits). A character with a prosthetic has full use of the lost limb, but is no longer resistant to Ion damage and takes a –1 penalty to Use the Force checks for each prosthesis (to a maximum of –5).
Modifying cybernetic prostheses generally follows the rules for equipment upgrades given on the Modifying Equipment page, with the following specific caveats:
Prosthetic arms and legs begin with 1 upgrade slot by default. Prosthetic hands and feet begin with 0 upgrade slots. Gaining additional upgrade slots requires reducing prosthesis functionality ("stripping" the prosthesis). Each method of stripping can be done only once per prosthesis. See Stripping Prostheses for available methods of stripping.
Prosthetic limbs can generally use any of the equipment upgrades given in the various SWSE rulebooks. See Prosthesis Upgrades for a list of possible modifications. Note that other modifications not included on the list may be available. Installation of prosthesis upgrades requires a DC 20 Mechanics check and 1 hour of work per 1000 credits of work (to a minimum of 1 hour).
Weapons and Equipment can be mounted on a prosthetic limb with a Weapon Mount upgrade or a Dual Gear upgrade respectively. Weapon installation requires 4 Weapon Mount upgrades (consuming 4 upgrade slots) for a Large weapon, 2 for a Medium weapon, 1 for Small weapon, and 0.5 Weapon Mounts for a weapon of Tiny or smaller size. Equipment installation requires 4 Dual Gear upgrades for Small equipment, 2 for Tiny equipment, 1 for Diminutive equipment, and 0.5 for Fine equipment. Weapons and equipment installed in a cybernetic prosthesis can be modified in turn with their own upgrades. Mounted weapons and equipment begin 0 upgrade slots by default and must be stripped to gain upgrade slots.
Prosthetic eyes generally cannot be upgraded using the rules given above for arms, legs, hands, and feet. See Prosthetic Eye Upgrades for a list of possible eye modifications. A prosthetic eye can have one upgrade at most. A basic prosthetic eye costs 1500 + 500 for surgery. Component costs given in the Prosthetic Eyes document are in addition to the base prosthesis component cost, while surgery costs can be substituted for the surgery cost of the basic prosthesis.