AR-15 Calling Rifle Possible Specs

I have heard that the 18's and 20's are not as loud. I was wondering if anyone has compared the length of barrel for sound and how much the length will add to weight of the rifle

kevlars
 
Don't take everything you hear to heart. A Chrome moly barrel is not un-accurate, a "chrome-lined" barrel is less accurate. And a A2 flash hider will not reduce recoil but it will reduce muzzle rise.
 
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