New Revere

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After a bit more tinkering, I have come to the conclusion that in my case the rattle stems from the fit of the air tube into the stock. What I believe is happening is that the for-end of the stock is moving and bumping the air tube. This causes the barrel band to move and contact the barrel which is free floated inside the barrel band with a very small tolerance. It only takes a minor movement to create the metalic sound. In my case the noise occurred any time that I put my hand on the stock for-end with even the slightest upward force. In my case I solved this problem by placing a small stick-on velcro pad in the channel of the stock about midway between the action and the end of the stock. I believe that this prevent the the for-end of the stock from moving and causing contact with the air tube. I am not sure how this rifle is designed and if the air tube is suppose to be free floated in the stock. From my observation, It appears that there is contact with the air-tube at least near the receiver. A slight warpage or imperfect milling of the stock fit could have caused the issue with the rattle and may be the reason some people experience the problem and some don't.
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I think you are confusing the shroud with the barrel. The barrel is centered in the shroud by the air stripper at the muzzle. The shroud is (for some reason unknown to me) designed to float in the top ring. If it is perfectly centered, as mine, there is about.010" clearance all around. Given the attachment design of the barrel/shroud assembly, this will invariably result in contact and rattle with the smallest of handling movements. 

Whether your air cylinder is free of contact with the stock or not, it is not the underlying problem with the shroud rattle. The shroud should either be well free of all contact, or, set up with a consistent pressure point, as in Beanland's mod. My rifle shoots great without the band, and I'm always in favor of fewer variables. This is the overwhelming design of most precision air rifles. And it's Daystate's design in most of its other rifles.
 
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The Revere is just the newest rendition of the original Huntsman. Which was marketed as a sporter hunting rifle. The only reason the band is there in the first place is for the major flub up, tripped and fell on my rifle or caught a stray sioux arrow in the leg and have to use it for a crutch to get back to camp. Its not for any sort of support. 

I never measured. But the barrel appeared to be a good 12-13mm thick.
 
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After seeing this, I had to go check my revere I received in February from AoA. It never rattled or anything.

When I tried to wiggle my barrel, it did move a slight bit, but it seems to be tensioned against the airtube - shaking it won't make a noise, but "lifting" the muzzle will. It's been rock solid accurate so I don't think I'll do anything to mess with it.
 
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After seeing this, I had to go check my revere I received in February from AoA. It never rattled or anything.

When I tried to wiggle my barrel, it did move a slight bit, but it seems to be tensioned against the airtube - shaking it won't make a noise, but "lifting" the muzzle will. It's been rock solid accurate so I don't think I'll do anything to mess with it.
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The AOA tech told me that barrel shroud is supposed to float within the band with no tension. So, one could ask, why have it? If your band is in contact with the shroud, as yours appears to be, then pressure is formed that can change with conditions. Since your accuracy is good, and consistent, I wouldn't mess with it either. In my case, the shroud did indeed float within the band, but with only .010" or so clearance, any slight bump would rattle. So, I decided the band was simply unnecessary and removed it. If, as in your case, the band is creating a pressure point, and it shoots well, then no harm done, although I fail to see the benefit either. If using the band, I would be sure it is secured very snug, as any bump sufficient to change the tension against the shroud, will change POI. I proved this to myself by inserting a small shim between the air cylinder and shroud, and it moved te POI 4 inches at 25 yards, or about 16 MOA. 
 
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