I found it odd when NPCing a techmarine character today that the servo-arm is so godawful powerful and has the same armor pen as a lascannon. The bulky raw damage I can understand, and I could also buy it having that sort of pen if it was hydraulically crushing something after a successful grapple, but it seems extreme as-is. Checked the errata for it and found nothing.
Has there been a discussion already about how apparently weird these stats are?