Asked by geoz48 on May 28, 2017

which

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This is a mil-spec rifle with 4150 barrel and 1:9 twist which means that the temperatures and pressures generated pushing the bullet down the barrel will be less than a 1:7 or 1:8 twist and it will last longer. It should be happy with 55 to 62 grain bulle

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Core 15 Base M4 Scout

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