The build quality is depend on the which brand you want to buy.
Tokoyo Marui is ABS body and the build quality is pretty good.
Classic Army is full metal but it's somehow hard to get one.
Jing Gong is platic body as TM as well and it's 100 % clone and aftermarket part will fit on there as TM, but it need a little work on mechbox for long time usage.
CYMA is good for money, you get what you pay for and it might be the last choice for me to get it but still it's 100 % TM clone, aftermarket part will work on that too.
The rest, I don't know at all.
Originally Posted by Dexst
will build quaility be the same? i found a review for the ump but not the mp5