Plastic bag? - Dead Air Armament E-Brake

This isn’t what I was expecting. First DA ships this in a plastic bag, nothing else. Second it does not look like it fastens on the suppressor in a way that I’d be confident it isn’t going to dislodge. There are no threads for securing it to the suppressor, only pegs like a caliber cap. I’m sorry I didn’t do better research. They actually describe using this in a probe position to mitigate blast dust while lying in dirt, but it’s so long I’d be worried it will fall off long before you ever get to test it in adverse conditions.