The FBI-10 is a fictional firearm made up by Krinkels, firing a 10mm cartridge. It was first seen in Madness Combat 10: Abrogation held by one of the l33t agents absorbed by the Auditor. In Madness Combat 7.5 it was used by an A.T.P. engineer who was killed by Sanford. Sanford then picked up this gun and used it against several other A.A.H.W. units. When asked, Krinkels stated that the fictional weapon was in the same weapon series as the FBI-9, and in Madness Combat 7.5, a box was labeled to contain FBI-10 submachine guns. It appears to resemble the PP-2000 and PM-63 submachine guns.