So a weird problem came
My newest BeardLib mod:
https://modworkshop.net/mydownloads.php?action=view_down&did=17680

Added Brenner Foregrip to G3 and overriding the standard G3 barrel (g3_b_long), with the model from Brenner's barrel

Using this mod with all the attachment it gives on G3
It seems, I can't stay connected to any game at all.
When connecting as a client, I can only connect 100% to Host, the other client will keep 'Joining' status
Even when the lobby is just me as client and host, after connecting for a while, I'll dc with messages (Lost connection to Host)

When I'm hosting with G3 and this mod
Any client that tries to connect won't connect at all.
Not even a connecting progress message (0 to 100%) will appear in game.

This is very confusing for me, because my other mod that adding new foregrip and overriding barrel (AMCAR Overhaul, L85 LMG) is working just fine
Anyone knows what might be the cause to this?

Ah also, I can't seem to forbid the game from installing the Assault Kit when my G3 HK21 attachment is installed.
Even though I already stated in the hook to forbid g3_b_short when G3 HK21 is installed.
Is the assault kit string is not g3_b_short?