I am actually quite pleased with mine. I did use it as an entry level to a GBBR. I've dry fired it probably 1000 times, and put about 200 rds through it, with no issues at all. The magazine leaked out of the box, but all it took was some silicone oil to get it working mint. I've spent another $5-600 on upgrades already... but not because I had to.
Mine is tight, solid, and feels great. I fear these may just be hit or miss with the quality. Lucky for me, mine is pretty darn good for what I paid for the thing.
Founder of Capital Airsoft in Edmonton
Out of the Game 04/22/16