No...you will never see a suppressor (that's the correct term) on a revolver. The space between the barrel and cylinder makes it impossible.
With a well made suppressor, you hear a mechanical sound...the hammer falling and the slide ejecting/chambering another round. Sounds like a loud click. In an automatic weapon, it sounds like a sewing machine on steroids
You also may hear the bullet if using a round that's over 1000 ft/sec velocity...it's a little sonic boom that sounds like a crack...the bullet is supersonic. The sound will be relative to where the observer is standing...it will come from the point abeam where the bullets passes. Use of subsonic ammunition minimizes this effect.
The barrels are usually threaded on the outside. The reduction in "kick" is from the weight of the suppressor. Suppressors are a lot larger than you think...they have to be...they have to absorb the expanding gas in an expansion chamber and most good ones use a baffle system to dissipate the gas energy prior to exit from the end. They make them for pistols, but most commonly it's a .22 caliber to minimize the hot gas it has to handle. The size you see in the movies is BS...for example a very quiet suppressor for the H&K MP-5 9mm is 11" long and 2.5" in diameter.
