IF you insist on riding with THAT FW, set the high limit screw so you can't use that cog.
You're going to "gobble up" you chain which will then cause undue wear on the chain rings.

Usually Falcons eat up bearings before something else happens to them. They tend not to be long lived.
I'm not sure if a Shimano or SRAM replacement fits. Falcon MIGHT be a different "animal", with different threading???
Maybe someone knows for sure.