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Posted by: KamelToad
The only way to silence a bullet is to make certain it doesn't break the sound barrier. Roughly 1,050 feet per second at sea level.
Most firearms featured in Halo seem to be little improvement upon what is available today(M-6D excepted).
There is an outfit called SSK that had developed a series of cartridges they call 'Whispers'. It features a rifle caliber bullet of high sectional density and ballistic coefficent that is crammed into a shortened case and exits the barrel just under the speed of sound. Google '.510 Whisper' and it will Wiki some info on it.
These rifles are super accurate, but you'd have to lead the bejesus out of any moving target. A needler probably moves faster.
Fail, the bang from the gunpowder makes a noise.