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Most M4s that are standard carbine length (14.5 inch outer barrels) will have 360ish inners. Inners will vary accordingly to the length of the outer barrel.
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It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle
-Founder of Steel City Hamilton Infantry and Tactics
- Certified level 43 Autosniper by Commander Amos
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