Very disappointed - AS Designs Arc-Fire V2 Ambi Kit, 0-45-90

Got through maybe two 30-round mags with this thing—mostly fired semi-auto, mind you—and it broke already. The portion of the selector bar that the primary selector switch threads sheared off for some reason, and I can’t figure what could have caused it. I studied the installation manual a lot before installing, and as I mentioned, everything seemed to be functioning fine for a bit before it all went downhill.

Contacting the manufacturer seems almost impossible, and of course I can’t return it because it is final sale. Overall I am NOT impressed for the price of this thing. Hoping I can at least find a replacement part, although their website doesn’t seem to list it.