Figured I would make an official report here for visibility.

As per title, ammo types are not available for production at assemblers, I had some issues earlier with guns not firing but that seems to be fixed.

Ammo can be spawned manually using shift+F10 but assemblers do not seem to have the recipie loaded.

Issue was noticed in a heavily modded survival world at first.

Tested in a new world in creative mode with only WeaponCore and MWI loaded, same results.

Tested again with Meridius's ammo manager installed also: (as it was listed as a dependency for the non-WC version of this mod)
https://psteamcommunity.yuanyoumao.com/workshop/filedetails/?id=1423362131

Same results, have verified game cache and deleted/re-downloaded the mods.
Happy to submit any logs if necessary.

Cheers!