Anyone dabbled with their shroud?

[Ed38574]

In an attempt to quiet down my trail a bit, I tried doing a couple things to the shroud. I opened up the holes in the end cap to 3/16, and it did not make a huge difference. I then took it apart again, and drilled 4 1/16 holes at the rear of the tube just I front if where the tapered cap goes on to let the air escape. Now it doesn't make such a "snap" out the muzzle, but it's still not where I want it. I may try to make some baffles to go inside the shroud. Has anyone else had success quieting their trail?

[Ed38574]

I think I may try using scotchbrite to make the baffles. I think that should diffuse the air pretty well. Maybe drill more holes in the end cap as well

[uncle paulie]

Some folks use Magic Eraser for the baffle.

pv

[shorty]

No changes to the shroud and or additions to the shroud will make it quieter. Been there done that.

The only thing that can quiet the trail np is a plastic stop at the end of the compression chamber and or a custom piston seal with a nipple on it ( not made yet ) to prevent metal to metal contact slam when the piston comes home.

The piston slamming home is the sound you are hearing.

[robtmc]

I would tend to agree with Shorty.  I did a test prior to investing effort into fitting a LDC to my Trail NP.  Set a remote recorder up to get both unsuppressed and a shot with a 2L gatorade bottle in the infamous soda bottle setup.  Assuming the plastic bottle was at all effective as a LDC, there was no perceptible reduction in sound at the remote recording site.  Same thing with a RWS 48/52 which is actually a bit quieter than the Trail though a lot more powerful.

Have to agree it is piston noise we hear, not muzzle blast like on a CO2/PCP.  Why internal buffers are not fitted may be a good question for the airgun experts around here.

[shorty]

Come to think of it. The seal may not need a nipple.The end of the piston where the seal goes onto is tapered fit. Actually, the seal fit is very tight and hard to remove and or put back on. Now I am curious to know if the end of the piston is ground down a little to expose plastic instead of metal, would it deaden the sound a little better.

while on that topic, I am also curious to know if FPS would be increased since there may be some extra stroke.

[56S]

Curious to know why after 3,500 shot my Titan shows no evidence of ever slamming the piston into the end of the compression tube.  I thought this too until I was told that even in a dry fire the piston stops and rebounds slightly and then settles on the stop.  I even opened my air passage way from .123 to .138 and although so very little difference in velocity, I did make a smoother shooting and more accurate rifle.