My FM KJW M9 has a busted trigger spring, inner barrel and when I shoot my magazine flies out of the mag well. And I havent even put 200 rounds through it. I've ordered a new inner barrel and trigger spring, dunno what I'm gonna do about the mag well tho.
IMO they are good budget guns but if I had the chance I'd take a Marui any day of the week.
In fact if I hadnt spent a lot on the pistol itself I'd just switch over to another brand of M9.
After buying the Marui 1911 I dont think I'll ever go with another brand.