FFS. The follower is missing a piece that pushes the catch up..
The part below where it says Evike.
Problem solved.
EDIT:
Just an update. If anyone else is having this problem, I found a link in another thread to Capital Airsoft, whom apparently have these for sale. Unfortunately, the site is down, so I can't check right now.
http://albertaairsoft.com/store/prod...d_product=2271