Not nitride finish as described - Faxon Firearms 9mm A2 Flash Hiders

The description online and the package both say this flash hider has a nitride finish, which would be shiny and black as shown in the picture online. This flash hider has a dull dark gray finish which appears to be manganese phosphate, absolutely not nitrided. My 9mm AR pistol has a nitrided barrel, and I'm trying to get a flash hider that matches, but this is now the third brand of 1/2"-28 threaded 9mm A2 flash hider I have purchased that has been advertised as nitrided but not finished as-described, Aero Precision APRH200031C and a store-brand elsewhere being the other offenders. Otherwise, it looks fine, so if you want manganese phosphate, go for it, but it's useless to me.