10.3 Crane Spec 5.56 NATO .070

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10.3 MK18 (Crane Spec)
Our 10.3" Crane Spec options 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. 

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