Revolvers and suppressors

its been done rather successfully... nagents and a specialized ruger red hawk were produced with great results. I believe knights armament produced them...

Fairly extensive thread on this here : http://www.silencertalk.com/forum/viewtopic.php?t=2887

Basically, a revolver can be suppressed, but it's a lot more work. Something like the Nagant, which pushed the cylinder forward to make contact with the barrel, is actually optimal.

The above thread also talks about the tunnel rats' guns.

Those revolvers were purpose built for the tunnel rats, they used a "silenced cartridge" that fired a bullet through the force of a piston hitting the back of the projectile if I recall correctly. They were very short barrelled and were .44's.

Also due to its unique design, in which the cylinder moves forward closing the gap when the hammer is cocked, the Nagant 1895 Revolver can be suppressed.

Dang, you have got to be quick on the high road.