The designs incorporate technologies which are largely considered to be trivial and common (maybe due to IP expiration or something) in Nepleslia, but are not in the Gartagen Union. Don't take this the wrong way, but it's basically the same the same as Steyr Manlichter going defunct and their Ugandan branch deciding to open a new company in Uganda with their current know-how, vastly improving the Ugandan arms industry.
And therein lies the issue. Even if Steyr is defunct, those patents and designs (even the ergonomics and outer casing as something independent of all the mechanisms count as a form of intellectual property) belong to somebody.
Not to mention there are all sorts of moral and ethical issues wrapped up in this situation, like the Gartagens being handed antecedents of Nepleslian technology (which has been a point of contention before), despite being expansionist and militaristic. It's a problematic situation, and you really can't expect non-intervention in light of that.
Technological uplift should always occur under controlled circumstances. The Lorath pretty consistently demonstrated why just handing people old or underused stuff could backfire.