I know he was a authoritarian, racist and ultra nationalist.

I'd like to see a citation on him being a racist. He was still very much a sexist authoritarian, but that's par for the course when it comes to black nationalists; scratch that, nationalists in general.

Though I think there could be some interesting discussion about cop patrolling and the use of guns to protect minorities.

...You might want to rephrase that; it sounds like you believe that a police force can be formed to protect minorities using guns. I assume you're referring to the Black Panthers' use of firearms to protect black people from police brutality and how those tactics would useful to today? Insofar as how that links to anarchism, I always thought that the general idea of pro-gun ideas from anarchists could be crudely simplified as "minorities should have firearms in order to protect themselves from fascists that work inside and outside of the law", which I don't think is wrong so much as it is overly simple and ineffective in modern times for various reasons.