If by "Does it work?", you mean "Can it get you 10 years in a Federal prison?", well, yes, it works quite well. If you attach ANYTHING to a firearm that reduces the noise evenly slightly, you have an unlicensed suppressor, and can get to meet the folks in cheap suits with bulges.
If by "Does it work?" you mean "Is it an effective suppressor?", then no, it is not. If that really worked, folks would not be paying Yankee Hill Machine $350 for a suppressor- we'd all be down rooting thru the recycling bins.
And I really don't mean this as a slam- but have been hearing that one for years- along with "pull the nipple of a baby bottle over the muzzle" and "Stick a potato on the muzzle." (Irish, Sweet, Baked or mashed??) And my favorite "Dad said they used to put a rubber over the muzzle." Yes- if Dad was in a landing craft- you did that to keep water and crap out of the bore.
PART of the sound of a weapon firing is the muzzle blast- which a suppressor helps tame. The action cycling also makes noise- as does the KERACK! of a bullet breaking the sound barrier- suppressor do nothing for those two.
However, you might search the term Silent Without a Suppressor. Yes, legal. Yes, limited but effective. I use CCI CB Longs in a Remington 550-1. Limited range and power- BUT- quiet enuff you hear bullet hit target- and that 550 will cycle them as a semi-auto. No suppressor, no ATF paperwork, and no "Bubba" for a roommate for the next 10 years.
What we have here is... failure- to communicate.