What is the quietest co2 rifle?

Answer 1

Your question is about Co2 systems, not Springer's or Pumps. That eliminates a few air rifles.

The system that quiets the "report" (The noise) that a rifle makes is called a "Shroud",. Basically it's a silencer for air guns. Because shrouds are additional material added to the air rifle they increase the cost of manufacture, and most manufactures don't put them on air rifles. However there are a few that do install them on the higher end (More Costly) models like the Marauder rifle that is capable of using either air or C02 as the power source. Another rifle is the Airforce "Condor" (It has 12 different barrel designs) If you use one of the 12" barrels that sits within the shroud, then it is very quiet. (I own both of these rifles.)

But the quiets rifle I own is a "Raptor Carbine" This is a custom design. The Shroud extends about 4 inches beyond the barrel. The only noise I hear is a slight puff and the pellet hitting the target. However all three of these rifles are costly, starting around $350 on up to $1200.

You can check Pyramydair on the web and look up the noise rating in the specifications to see how each rifle is rated. An example is the Crosman Challenger that is rated at 2: medium (It has no Shroud) but is fairly quiet and cost $600