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I have seen a ton of makeshift silencers for various guns over the years. Everything from jamming a potato on the barrel to the classic shooting through a pillow method you see in many movies.
The above method involves wrapping steel wool around a pipe and then encasing the entire thing in an empty water bottle and sealing off the end with metal repair tape.
In theory I assume this would silence the pistol. though I have never experimented with this contraption. I prefer the manufactured silencers from the large weapons companies that insure maximum silencing of the gun and also the ability to maintain the bullets accuracy and power.