Can a 2-liter bottle really work as a gun silencer?

[spingears]

@Scumpup

FTR, A good friend of mine is expert on suppressors. He’s manufactured them and authored several books on them. He will be the first to tell you that suppressors are fairly simple devices, but they must be manufactured with care and to tight tolerances. The higher pressure the round involved is, the more important the proper choice of materials and attention to detail becomes. He will also be the first to tell you that “improvised” suppressors never function well, last long, or have anything like a comfortable safety margin.

In addition the silencer/noise suppressor MUST be fitted to a specific firearm(s).