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I've experienced a couple of slam fires in one of my ARs. These were definitely not NDs. This rifle normally shoots just fine without any malfunctions. When the slam fires happened, I was testing a hand load cooked up by a friend which he had been using successfully as a deer load in his own AR. I had previously fired that load myself in his rifle with no drama. But in my own rifle, it produced two consecutive slam fires in which two trigger pulls fired four rounds. I unloaded the rifle and didn't fire any more of that ammo in it.

However, the rifle only slam fired when I pulled the trigger. It did not do so when I released the bolt.