This does NOT appear to be an honest slam-fire problem. This was a modified Oly Arms AR: and while I'll freely admit that I'm jealous that MY Oly doesn't have "da switch" it is very clear that this one did.
The AR-15 in question fired three rounds in rapid sequence, then broke down totally, like an old car in the Nevada desert.
Clearly, the method used by the legislators and prosecutors here is PREDATORY against gun ownership in general.