A bionic arm is a very useful replacement for a natural arm. They are universal and can be installed on either left or right arms. 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 9 damage when an attack uses that arm, compared to 7 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, and are rarely 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, a heavy penalty to anyone with the Body purist trait and a lesser penalty to anyone else.
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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.