LEX are not unique to any KF-5s, an American modification
Such as?
A single bomb that isn’t even guaranteed to come to the game because of it’s range.
It’s completely undistinguishable from a late block US F-5F or F-5N. The only real domestic mod is a bomb that isn’t unique to the airframe. Just own up to it being copy paste.
Is the plane its based on imgame? No.
The isreali chapparal was not a copy paste, it was added along with the US one.
It is not currently a copy paste.
The issue isn’t if it’s ingame or not. There is only 1 unique Korean thing about the entire plane and it’s not even specific to the plane. Already most of the features that are claimed to be unique on the KF-5F are present on the various in game F-5Es. Yes the Chaparral is copy paste even if it was added in the same update. People were pissed about the various M109s variants added instead of unique stuff even if they were added in the same update.
By that logic, the Sherman Firefly and the M-51 are just copy-paste Shermans. You seem to have an oddly expansive definition of “copy-paste”. What it actually means is when the vehicle is literally just Ctrl+C, Ctrl+V without any changes.
“Variants” are very different from copy-paste, and every nation other than USA and USSR is at least partially reliant on variants of other nations’ vehicles.
No, it’s more like if you take an M4A2 then add a HVSS suspension, add an M1 76mm, add the drivers and machine gunners armor plates, add the late war ammo stowage, then act like its entirely new tank because it has HVSS while the M4A2 76 in game doesn’t even though it was a US upgrade and the US used it on their late war M4A2s.
There isn’t a single domestically designed Korean system on the KF-5F and would be identical to a US F-5F. Meanwhile there is no US equivalent to the Firefly or M-51 as those both use unique guns mantlets and engine for the firefly.
Likely because both use the same IHQ package improvements: W6 chisel-shaped Leading Edge Root Extension (replacing the W4 on the current in-game F-5Es), rounded shark nose radome, and auto-maneuvering flap system.
The LERX and nose radome were initially developed for the F-20, and later introduced as a modification for the F-5E/F (a lot of late production F-5E/Fs had the full IHQ package from the get-go, but some older aircraft were retrofitted with it).
There may be some very minor country-specific localized modifications, but that gets way too much into hyper-specifics.
I’m pretty sure AIDC and KAI (or it may have been Samsung or another company that license-built it) likely produced them to similar, if not the same specifications