Good afternoon. It seems to me that the first military research should be blocked by copper proccesing, or it should be changed a little.
The problem is that the player can study the miitary technology and the turret gun, can craft them, but the ammo requires copper, and without the ammo these 2 technologies are a bit useless :)

Hello, sorry for delay.

I'm probably forgetting a specific configuration here, as it's been a few months, but I am not seeing the early magazines requiring copper, except in some alternative optional recipes in niche setups. Can you help me figure out if this is an issue in a setup you are using?

Please forgive me for the long answer, I'll take a look at the weekend, but I have a fairly large modpack
.

I have default modpack of SE + K2 + Very BZ. (and some QoL mods)
As I see in technologies -
The following mods affect the Turret research:
Base mod -> AAI Industry -> Krastorio 2
The following mods affect the Copper processing research:
Aluminum -> Atomic Overhaul
The following mods affect the Rifle magazine recipe:
Krastorio 2 -> Space Exploration -> Lead