No need to try and source the virtually unobtainable Fortis wrench. The Fortis barrel nut takes a standard spanner wrench. I bought the Tapco armorer's wrench for the nut on my MV. Bullseye Sports has it. Good price too.
http://www.bullseyelondon.com/tapco-intrafuse-ar-armorer-s-tool-canada.html
Even has a beer opener on it, just in case.
Did your barrel nut have the pin holes?



























