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Don't worry about barrel length and size of guns. As long as it's a bona fide AEG and not an MP7, they can all be upgraded to approximately the same level. Never seen a 400 fps MP5K, but I doubt it would be too different from a 400 fps MP5A2.
Some people even believe that beyond a certain point (some mention 247 mm) you get drastic diminishing returns and the length could cause more problems than gains with accuracy. (see M16 barrel wobble)
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