Thread: M4 cqbr
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Old May 4th, 2009, 19:44   #12
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Join Date: Jun 2002
Location: Toronto
363 is standard for the M4 carbine/14.5" outer barrel length.
You can also get a 407mm inner barrel, which is referred to as "M4+ length". It would protrude slightly in to your flash hider, but it would completely maximize the available length.

CQBR's are either 285mm or 300mm. 300mm may protrude slightly in to the flash hider.
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