Alright... I decided to give the mags another try, and picked up a micromag a few weeks ago. Like the first mag I bought, it went from somewhat working to non-functional with relatively little intervention on my part, and I've no idea why.
It airs up fine, no leaks, but when the trigger is pulled, it goes "full auto" or leaks huge amounts of air down the barrel depending on what position the trigger is held at. I'm stumped. All the orings look fine, the trigger rod is adjusted so there is a sliver of a gap between it and the trigger. I suspected the sear might be worn but it looks like it should still work fine. (pic http://img384.imageshack.us/img384/8805/p1000697.jpg)
Any ideas?
edit- finally got it back to how it was before. The trigger just doesn't seem to return all the way unless you make a concious effort to make trigger pulls as quick and crisp as possible. Otherwise, it only seem to partially reset.