Why buy arms on the world market? Just attack an Afghan military base and take what you want when the Afghan soldiers run away. I don’t see any US type weapons in the cache.
From Uzbek group shows spoils from Afghan base | FDD's Long War Journal
And then the Taliban posts videos of a base and outpost they took over in the Afghan north.
Videos @ Taliban videos shows fighters occupying base, outposts in Afghan north | FDD's Long War Journal