The CR-WA91MSM is an Arm part that appeared in Armored Core: Nexus and later in both Armored Core: Nine Breaker and Armored Core: Last Raven
Part Description[]
Missile weapon arms (micro): variable launch 6/10 missiles.
Acquisition[]
This part can be unlocked during the mission, Eliminate Crest AC. To unlock the part, kill Genobee within 70 seconds.