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Originally Posted by RX-79G
I apparently made the mistake of offering some counter examples.
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So far the only examples of silenced revolvers any of us have offered have been modified in some way to cover the cylinder gap; you've offered no examples of silenced conventional revolvers and all I have is second-hand anecdotal evidence of them combined with my personal experience with silencers in general. So neither of us have any concrete examples.
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Originally Posted by James K
Just get a good size box and line it with sound absorbing material. Poke a hole just big enough for the revolver barrel. Stick the barrel in the box and fire (with a safe backstop, of course). With the muzzle noise muffled, see how much noise comes out at the b-c gap. Do the same for a semi-auto.
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While that's a pretty good idea and it would be a good thing to try, it completely leaves out a potentially important variable: back-pressure.
The back-pressure coming out of the chamber on a locked-breech semi-auto usually doesn't add much to the noise because the bullet has been out of the barrel for a relatively long time when the breech unlocks, but sometimes if the recoil spring is too light it can be noticeably louder. And straight-blowback semi-autos are often louder because there's more gas coming out of the chamber due the silencer's back-pressure.
The gas coming out of the cylinder gap due to back-pressure on a normal silenced revolver won't be as hot or as high-pressure as the gas that initially comes out of the gap, but I'm pretty sure it will be noticeably louder than the back-pressure gas coming out of the chamber on a semi-auto. But until I actually thread a revolver and shoot it with my Octane 9, I'll never know exactly how much difference the back-pressure makes in the overall sound.