Fuctionability i think there much the same(they work when there suppose to)- but some those chinese can be ruff(its variable) from what i understand.
The ruski& ugos having better finishs.

I really dont know whats imported into this(US) country now with ugos /russians .( just no chinese)

But back in 94 clintoon banned the importation of chinese firearms& ammo& that ban is still on.(gota chinese pistol or2 before that to)

One of the chinese ones i have was made in the late 50,s when the ruskis first brought the equipment to china to make them there sino/chinese early model according to the factory arsonal stamp- low sereal #*& other features& from what i have read on its history etc
The later chinese ones have cromelined barrels etc too.

I think the ammo can be some what hard to come by at this time- tho ussally reallycheap yep

Ps-sorry i didnt see the above about problems with the chinese ones- never had any with mine so -far.

15 or so yrs neglected some & many thousands of rounds later- for the $100 dollars i spent i cant complain tho.