Daewoo K2
Zastava PAP M90NP
Both are long stroke gas piston rifles. Both have adjustable gas settings. Both use AR Mags. Both have 1/7 twist 18" barrels. Both can mount optics in a crude fashion. Both were cheap when new and are no longer made/imported.
Now of course, the Daewoo is a more refined rifle. It took the best offers from the AK, FAL, and AR-15. The Zastava is a Serbian AK built in 5.56x45mm and mated at the factory with a mag adaptor. But the Zastava isn't a bad rifle by any means. Accurate, well built, and has strong aftermarket support. In the future it will be getting a Magpul Zhukov Stock and a Hogue Forend.
The Daewoo has less support but as a factory built gun. It works and works well. The OEM stock and handguard are comfortable and ergonomic. The trigger is amazing. Weight wise, it beats the Zastava by a pound of so. For a rifle of the 1980s. It is a hell of a lot better than the period Colt SP1 Carbines and Rifles in terms of features.