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I have the Carbon 15 pistol similar to this, but with the stock as pictured above.
The thing would never cycle properly until I installed a full-size recoil spring and modified the gas tube. Now it cycles flawlessly. Its really loud when the removable muzzle break is on - I usually take it off. Its fun to plink with, but thats about it. It has a 7.5" barrel. The lower receiver is made of some polymer/composite material and will not receive std mil-spec uppers. The upper is also made of the same polymer/composite material.