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There is a rumor, which may not be true, that with the right combination and size of holes, there is no need for a "can" on or over the barrel. There is another rumor that the old Mossberg .22's with the full length stock sometimes became very quiet without any muzzle attachment.
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Both rumors are untrue. This can easily be verified by actually shooting one of the above rifles. Porting a barrel vents gases and noise out the sides, closer to the shooter's ear. Porting a barrel and not using a can to contain the gases never results in lowering noise.
No rifle shooting the 22lr cartridge is quiet. Even those equipped with a good silencer are over 100 decibels.
Ranb