Also, I highly doubt sticking the muzzle in water would come anywhere near the suppression offered by a good silencer. So it would be pretty hard to tell how much difference the cylinder gap made because the overall volume probably wouldn't be suppressed much.
I've shot my Glock 19/Octane 9 combo in a closed concrete-walled garage before (I had a very good backstop and I was out in the country where it was legal) and it was still quieter than a .22 rifle fired outdoors. I can't imagine that sticking the barrel in water would offer anywhere near that amount of suppression.
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0331: "Accuracy by volume."
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