Haha, Nice experiment. The toggle normally can't open physically. It's part of the design and the main reason why the toggle knobs and ramps on the frame are present.
A less dangerous testing construction is described in German police manuals. The upper is placed on a wooden board, the back suspended against a wood ridge. Two nails prevent the upper from moving sideways.
Our forum video guru shadowdog did a nice demonstration using an empty 9mm case with a live primer.
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