They are classified as 'universal cyberarm' but work on none of the 4 arm types.
Apparently the 'Sensory Amplifier' mods are supposed to work on all four arms; gorilla, mantis, mono-wire and launcher, but they work on none. Tested at the Ripperdoc in Rancho Coronado. Bought each pair of epic arms that have one mod slot besides the projectile slot, and they won't go into any arm, while the specifically named launcher 'plating' mods do.
Apparently the 'Sensory Amplifier' mods are supposed to work on all four arms; gorilla, mantis, mono-wire and launcher, but they work on none. Tested at the Ripperdoc in Rancho Coronado. Bought each pair of epic arms that have one mod slot besides the projectile slot, and they won't go into any arm, while the specifically named launcher 'plating' mods do.