A bionic arm is a very useful replacement for a natural arm. They are universal and can be installed on either left or right shoulders (despite its name). It has 125% efficiency, increasing a colonist's manipulation by 12.5% for each bionic arm installed. A bionic arm's strength gives its bearer a melee attack of 12 damage when an attack uses that arm, compared to 8 damage from a natural arm. An installed bionic arm will replace a colonist's arm up to and including the shoulder. They can be crafted at a fabrication bench for 15 and 4 and are sometimes offered for sale by exotic traders and at Outlander bases.
As with all bionics, it will give a mood buff to anyone with the Transhumanist trait and a heavy penalty to anyone with the Body purist trait.
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Since bionic arms increase a colonist manipulation stat, it is advised to add them to colonist with a high skill level on Crafting or Medicine since those skills depend greatly on the manipulation stat. For example, a doctor will have a better chance at a high quality treatment if he or she has increased manipulation stats, and craftsmen will make objects faster.
In Beta 19 it received a nerf to efficiency but is now craftable.