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Any metal one that seals well, really. The sorbo pad is doing all the work for you.
As far as gear/motor combos, instead of trying to go quiet, just go fast.
It's going to be way easier to make the rapport as short as possible, instead of as quiet as possible. That being said, both can be done to some extent, just shim them really well and use bearings.
Helical gears will reduce the noise of the gears, but only if your mechbox is in perfect spec with the size of the helical gears. If the holes are just slightly too far apart, you'll get slack between gears just like you would with flat toothed gears.
And the last thing is matching cylinder to barrel volume to it's most silent point.
I have no freaking clue what that point is, but it requires undervoluming the gun silghtly. You want the piston to still be compressing air when it hits the cylinder head for a lower velocity impact.
I can tell you my VSR-10 was super deathly silent without even having an air brake; because the piston wasn't free floating at full speed into the cylinder head. 440fps spring still gave me 420fps, and the suppressor helped a bit (I was only using the last 1.5" of it though). Mind you the cylinder in that gun is probably meant for like a 550 barrel and I was running a 430 lol
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