I decided I wanted to play around with the possibility of building a real carbon fiber tube shroud mostly for looks but also to include the fourth baffle that Troy from Annihilator sends in his quiet kits and to save a couple grams of overall weight possibly. Well just by chance the original KRAL shroud is exactly 22mm OD and 20mm ID which is the exact dimensions of carbon fiber tube I was able to locate. So of course the original cap wouldn't thread in because there were no threads in the carbon tube so a little research and I found out its not recommended to tap carbon fiber unless backed with sacrificial sheets of laminate or woven specifically in that area to be tapped to transfer forces correctly. So, I decided to start grinding with a dremel until I was just able to force the original end cap into the tube then got some high quality 2 part epoxy and set it in the end of the tube, it's not coming out anytime soon. Then I also wanted to be able to use the fourth baffle including in the quiet kit like I said so I simply added the length (.700 inch) if I recall correctly. Then I didn't quite trust such a small set screw that the original shroud used and was also used with the quiet kit installed in the new stripper from Troy. So, I just got a grub screw out of the several hundred I've accumulated I swear I find grub screws in my underwear drawer they are everywhere, haha. Anyway I drilled and tapped the stripper on the end of the barrel from Troy up to I believe 5mm x 0.80. That made me much more comfortable with the carbon fiber material and this gun is shooting 60 ft/lbs regularly. Then last I wanted the shroud to go all the way to the scope mount because I feel it looks much better than stopping inch or so short and I wanted to use this rear section of shroud to help moderate noise if possible. There is no cap at the rear whatsoever it is just measured and cut very carefully then sanded to the final dimension so when the grub screw is installed into the shroud it holds the slightest bit of tension to square it to the scope mount. Now, I know what ur thinking how could it possibly stay concentric to avoid clipping the four baffles and end cap with just the 2 o-rings from Troys stripper holding it? I asked myself that too and finally came up with and idea to use two pieces of high density very stiff rubber about half and inch in length and only taking up 50 percent of the circumference of the space between the barrel and the shroud. If you think of a scope cross hair dividing it into 4 quadrants every other one has a rubber piece holding its centered perfectly so like a BMW emblem essentially one quadrant open free to air one with rubber spacer one open to air last with rubber spacer so at the rear of the shroud half of the space is open to atmosphere because its just resting against the scope mount with no type of seal at all so air can easily escape there performing the same duty as holes drilled into the rear section of shrouds we see all the time. Now in the original stripper this wouldn't have had an advantage but with Troy's having 4 large holes venting to the rear of the shroud it for sure performs some deadening. Sorry about huge post I just wish people would be thorough when they post things in case I'd like to attempt it so there it is as thorough as it gets. Final thoughts, substantially quieter than just quiet kit 3 baffles, looks a boat load better IMHO and maybe even dropped a few grams of weight. I'm very pleased with the few hours it took and I even have an extra tube from the 2 pack I got in case I jacked up the first one so I can experiment with a little different design if I want. Please comment or reply whatever on what you guys think especially the KRAL guys familiar with what I'm talkin bout!
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