They both will produce a tuning fork sound, audible with electronic hearing protection and in recordings. If the prongs were shorter, the ringing would probably be less, but flash suppression capability would probably degrade as well, I'm sure they did not arrive at the length by accident. Not all open prong designs produce the sound, the old duck bill 3 prong, the HK 4 prong, the Steyer FAL 4 prongs all produce either little or no ringing.
Roger Wang
Forward Controls Design
Simplicity is the sign of truth
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