Not entirely true.
Blank firing grenades use a special blank that also contains the delay element. Since they are an ammunition article they fall under the jurisdiction of Natural Resources Canada and would need to be tested and approved for importation and sale. Using a regular blank in one of these devices, while economical and more available, would go off instantly as soon as the spoon released. Not what you want.
I'll PM you Mike, I represent a major fireworks company here in Canada that is trying to get this type of thing accomplished. I must say that cooperation from across the Atlantic has been sorely lacking in most cases so I hope you can break that trend.
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