Got a buddy with one now...with 5 mags.
Constant problems with the mags, he just ordered some oval & square coil springs to test out to see if they resolve the magazine problems.
When it loads, it fires...but when it doesn't load....it's a disaster.
He's also informed Excel of the measures he's taking, and will post up on another site when the fix is secured.
After that, the info will be passed around the net