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length of a tightbore determines range and accuracy. while at close range, the CQB gun with tightbore might be more accurate, it wont be able to reach out to the longer range as the standard M4. now based on the fact that you are talking about two different M4 models, the difference is almost negligible. however, if you had say a tightbore MP5 and a stock M14, then the difference will become obvious. hope that helps.
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