I've usually been a lurker on forums since I'm a pretty quiet person online and have seen plenty of stuff you should and shouldn't post so hopefully you guys won't have to worry about me too much.

I just have one question -
I recently took apart my m4's gearbox since it was locking-up, failed at re-shimming and re-greasing it, and then had trouble putting it back together since the trigger spring kept popping out. Should i try to glue the spring in place or am i just missing something?(could just be a manufacturing flaw, I've heard the QC is pretty bad sometimes in AIM m4's)