It makes absolutely no difference and anyone who says otherwise is a liar.
My M14 scout has an 8" suppressor on the end and I literally have more empty space between the end of the inner and end of the suppressor than I have actual barrel. 300mm barrel and 305mm of space to the end. And the suppressor has only an 8mm aperture.
As fast as I can swing the gun around, I cannot make a BB hit the wall of the suppressor.
So don't worry about it. You could be running a 6" inner barrel on a 20" barrel and not see any detrimental effect.
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