If you are wondering if any progress made in the Chivarly 2 will carry over to the main game, the short answer is no. This is because all progress will be rest once the beta has concluded on June 1st.
The developers have also confirmed this and you can find the information via forum support post on the official site. In this posting, it says all progress players make in both the closed beta and open will be reset.
So what this means is any progress you make will not be permanent, and you will need to work to unlock weapons and customization options in the full release.
Related: All Chivalry 2 Classes Explained
Personally, we approve of the reset as it does not take long too long to unlock all weapons in the game. So for dedicated players, you shouldn't have any trouble unlocking the weapons again, plus it's also fair to new players joining into the game. However, what exactly can you even unlock weapon-wise in Chivalry?
Well, it's mostly cosmetic, but each class does have a selection of weapons they can unlock as they progress in the game. So, in short, if you want to unlock these weapons or unlock them again, you will simply need to play the game.
For more on Chivalry 2, check out Chivalry 2 Release Date, Leaks. & Everything we know! and Does Chivalry 2 support cross-play?