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re: Building a SBR Updated
Posted on 2/19/15 at 2:09 pm to CptRusty
Posted on 2/19/15 at 2:09 pm to CptRusty
quote:
what is the reason for this? what is magical about 8.5"?
in addition to what Chat mentioned, because of the rounds design, it burns all of its powder within 9" so you don't gain any velocity from a longer barrel
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