556 10.3 INCH M4 FSB CRANE SPEC

$449.00

10.3 MK18 (Crane Spec) Our 10.3″ Crane Spec complete upper receiver features the ideal gas port sizing (.070) to achieve minimal gas blowback when ran suppressed. This unit is specifically designed to be ran in conjunction with a silencer. We do not guarantee reliable cycling with some manufactures ammunition without the addition of a silencer. … Continue reading 556 10.3 INCH M4 FSB CRANE SPEC

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