May I throw in my 2 cents and say that the longer barrel will not really give you a huge or any increase in accuracy. Others will argue that, and if you had a mp5k length barrel you were lengthening, I'd say go for it. The barrel in your gun is already long enough to do the job. In my experience, if you don't mind the length of the silencer, leave the inner barrel out of it, because it WILL dampen the sound just a little. At DMR shooting distance, it will make it significantly harder to pin point where the shooting is coming from if your hidden well.
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