There have been several posts scattered about the forum about excessive recoil shaking scopes off the mini-14. The cure seems to be replacement of the gas bushing. I haven't needed to try it myself - my recoil isn't that bad. I bought mine used, maybe the previous owner already modified it.
I wouldn't discount a brand name just because it's cheap. Things Made in China get done for about $1 for a day's work. For the most part, the stuff from China seems to made well enough.
Now for my political message!
I stopped buying Made in China 2 years ago, when I finally realized that my dollars were going directly to the Chinese military.
My advise: After your dollar is spent, the damage is done, so don't throw things away. Just keep your Made in China stuff as a reminder. Inspect the next product before you send more dollars to our next Superpower adversary!