The following is Copyright to Prometheus Press and reproduced here without permission and without financial gain.
(Recovery time 7/21/35)
The BigRipp option, designed by NovelTech, places a twelve inch triangular blade of carboglaz hidden in the forearm. A meat limb has modifications that enable the blade to be activated without causing injury. The blades tensile strength is supplimented by having a slight triangular cross-section. Designed to penetrate armor, the BigRipp halves the stopping power of any armor.
If the BigRipp is placed in a meat limb it does not get the armor piercing advantage because of the insufficient bracing arrangements involved in the meat limb. Armors which use memory plastics defend as normal (add +50% cost of the armor). The blade is released from a seam either above or below the wrist. The carboglaz blade is available in an assortment of colors, gunmetal blue being one of the most popular. The blade does 1d6+3 + the cyberarm strength (1d6) + Martial arts scores ability (if any). This is killing damage. The skill Brawling cannot add it's damage. This is marginally legal cyberwear, in societies that permit weapons that so not have range but a permit must be presented if detected. A permit costs $100.
From the Erratta in the back of the magazine, which gives CP2020 stats:
BigRipp: This design uses monoblade tech, giving it all the advantages of monoblades in CP 2020, pg. 102