I would tend to agree with ArmySGT. There are two types of suppressors integral and not integral.
Of the integral silencers I have never heard of one that doesn't reduce the speed of the full power cartidge bullet significantly. This does not mean that the bullet is always reduced to below the speed of sound. It would take quite a suppressor to slow a 7.62x51 to this level. That is why some weapons are designed to use subsonic ammunition, ie the AI Covert.
Of the "screw on" types there are two VERY general varieties. The first has wipes that slow the speed of the bullet and capture the expanding hot gasses and release them slowly. These have to be maintained often, like every 10 shots and are very very quiet. An, example is the silencer on the old Hush Puppy pistol.
The second is the type that just captures the gasses and releases them slowly. These are what is usually seen on movies etc. They do not slow the bullet and they do not hinder accuracy. However, without subsonic ammunition, they do not work as well as other types. There isn't the crack of the bullet leaving the muzzle but there is a definate "echo" of the bullet going downrange. Check Youtube and thee are alot of examples of these. (I saw one that really showed the difference. It was a guy fiing an m14 mod with both super and sub sonic rounds. WOW.)
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