My first impression was "Wow no wonder it only costs 10 bucks" but, when I lubed it and smoothly put it in my SRC M4 it worked pretty much flawlessly. EXCEPT that the first few shots didn't feed, but all I did was take it out and then put it back and it worked like a charm.
Feeds "well" when lubricated often
Slight wobble in magwell
First shots don't feed
Glossy Plastic (Not high quality polymer like it's $20 counter-part)
Doesn't match tan that good
Spring locks back
If you don't care for looks and want a magazine that works flawlessly when lubed this is the mag for you!