Designed by Matanza as a replacement for the stopgap AVR-30 modifed machineguns used by the Avatars, the EnLarged Combat Rifle Model 3, dubbed "Medusa" by it's primary testers for it's ability to kill most creatures dead as stone was sent with Kanine onboard the ISC for field testing with the Avatar program staff. The ELCR M-3 is essentially an enlarged and modernized version of the old Matanza COBRA rifles used by Marine Force recon as a DMR. In it's standard and PDW configurations it fires a 20x80mm tungsten jacketed armor piercing explosive, fin stabilized, sabot discarding round. In it's sniper config. it fires a 25x80mm rocket-assisted supersonic explosive hybred munition. Like it's parent weapon, the COBRA which was a predesssor of the CARB rifles used by Sec-Ops, the ELCR M-3 is highly modular, the rifle can be converted to almost any configuration simply by changing the barrel and parts of the receiver. Extremely accurate and powerfull, but lacking in fire rate (it is semi-automatic) and magazine capacity (15 rounds), the M-3 Medusa is capable of dispatching most Pandoran fauna in it's standard configruation, the sniper variant can even stop a Hammerhead cold in one shot if it strikes the brain.