I love the overclocked weapons that you can find at Lola's, these are pretty hard to find but it is worth the time, they are more powerful, and even better against Castillo's army.
Here are my top 10 best black market weapons based on how powerful they are :
https://www.gamersdecide.com/articles/far-cry-6-best-black-market-weapons: (https://gamersdecide.com/articles/far-cry-6-best-black-market-weapons)

My top 10 best far cry 6 weapons are based on their power.
I've had a blast using these weapons and love how far cry 6 makes you create mass destruction and tackle missions the way you want.
https://www.gamersdecide.com/articles/far-cry-6-best-weapons: (https://www.gamersdecide.com/articles/far-cry-6-best-weapons)

Here's my first public game review of a game, I wrote about Farcry 6. I've been playing the game for some time now and I think that It is a solid entry in the franchise, the game has something for almost any gamer who craves action and adventure but this formula is already too overused and I expected more changes besides the location, villans, and some guns.
If you're searching for a new game to play this may be the one. But I strongly recommend waiting for a good sale.
Here's the review: https://www.gamersdecide.com/articles/is-far-cry-6-worth-it: (https://www.gamersdecide.com/articles/is-far-cry-6-worth-it)
Let me know your opinions.

I've made a top of the most powerful weapons that you can find early in the game(On the first Island).
I find it very powerful to have the upper hand against Castillo's Army, especially in the last tutorial mission.
https://www.gamersdecide.com/articles/far-cry-6-best-beginner-weapons: (https://gamersdecide.com/articles/far-cry-6-best-beginner-weapons)

In Far Cry 6, you will need to overcome and adapt to a lot of scenarios, you will need the right weapon for the job, or use the good old assault rifle that will never let you down. 
I wrote an article about the best assault rifles to deal with Castillo's army.

So here are the top 5 best Assault Rifles: https://www.gamersdecide.com/articles/far-cry-6-best-assault-rifles: (https://www.gamersdecide.com/articles/far-cry-6-best-assault-rifles)

I didn't find a good article about the best rifles in FarCry6, so I made one myself.
some of them are really hard to find but they really worth the time because they are a blast to use against Castillo's Army.
I've made a top 5 best rifles in FarCry 6 based on how powerful they are: https://www.gamersdecide.com/articles/far-cry-6-best-assault-rifles: (https://gamersdecide.com/articles/far-cry-6-best-assault-rifles)
I hope that someone finds that useful, and it was a good experience to research facts about the game for this article.