It's pretty much only good as a 3D instruction book. It may last 10 rounds it may last 100,000 rounds QC is a bit shoddy and you might get a lemon or a cherry.
That being said the general trend is for "crappy" guns with a few outliers having lasted a long time.
Fixing/repairing/replacing parts will end up biting you in the ass, especially with "piecemealing" parts one by one (it ends up being expensive and some aftermarket companies don't play well with others as well as possible fitment issues that will likely require the use of hobby files, dremel tools, and other such equipment in a "home hobby workshop"). It's much better to get a quality gun right off the bat IMO.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE