ACI-15 556 Crane Spec Upper – 10.3 MK18 PARTIAL UPPER ASSEMBLY
Our 10.3″ ACI-15 556 Crane Spec Upper (Partial) 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.
– 10.3″ 4150 CMV Melonite – 1/7 Twist – .070 Gas Port – M4 Feed Ramps – Carbine Length Gas System with F-Mark Front Site Base – Front Site & Sling Swivel – Delta Ring Assembly – QPQ Corrosion Resistant Finish – 1/2-28 Thread – Dry Film Lubed Upper w/ T-Markings – Forward Assist – Ejection Port Assembly
* (Not Included) Muzzle Device, Handguard, Standard Charging Handle & M16 BCG
Click Here for the Complete Crane Spec Upper