"Ginuwine1969"Quiet is very subjective, in comparison to a hand gun all airguns are quiet; but in comparison to a mouse fart........is you're gun quiet? Readers want to know, how are you taming the beast.
Evgeny had to make decisions when he designed the Vulcan. He knew from experience he couldn't please everyone's needs. He chose light weight, compactness, accuracy, and innovative new features, for his Vulcan. "Quiet" was a compromise he had to make to permit other features in a .25 caliber. The Vulcan .22 is very quiet. The .25 is louder. Most hobbyists prefer accuracy and shot count over silence.
The Vulcan's shroud has two screws 4.25" from the end cap of the Vulcan muzzle. Those two hex screws hold the threaded adapter that screws onto the end of the barrel. 4.25" is a very short moderator for a .25 caliber.
By Adding eight vent holes at the base of the shroud, I experienced a noticeable reduction in discharge decibels. It helped, but it didn't get the gun down to "neighbor friendly".
To completely silence the Vulcan .25, I added a screw-on moderator to the shroud. That increased the length of the Vulcan by six inches. My need for silence was satisfied at the cost of compactness.
If a Vulcan owner examines the baffles in the shroud, it will noted each baffle has long sides, a hole in either side, and O-rings above and below the side holes. The Colibri, one of the quietest pcp's I ever owned, has a similar design. The Colibri had small vent holes along each side of the shroud, where the baffle side holes were located. It occurred to me that adding side vents, in addition to the rear vents, would further reduce the discharge sound to acceptable levels.
This is my next modification, and it must be done very carefully. Drilling vents holes in a circle is not too difficult if one is careful. Do less than this and the shroud looks "cobbled" or less than attractive as a result. As one reader so humorously put it "
It looks like detritus on an albino equine!!!" This is especially true for the horizontal vents.
What I "hear" is not what everyone else "hears". Volume of sound perceived is dependent on pitch, actual decibels, duration, and each person's individual ability to hear certain specific frequencies. What we "hear" is very much an individual experience!
My belief is, by artificially increasing the shroud/baffle capability through "venting" excess air pressure, I can get the .25 Vulcan's discharge sound down to "neighbor friendly", or even "neighbor unnoticeable".
I will advise you of my results.
