The Gemtech GVAC Upper Receiver is a revolutionary 5.56x45mm NATO assembly specifically engineered to redefine suppressed shooting. It features a 16.10 4150CMV steel barrel with 5R rifling, a 1:8 twist, and a specialized GVAC profile designed to significantly reduce gas blowback. Built on a forged 7075-T6 aluminum receiver with a Type III hard coat black anodized finish, this AR-15 unit includes a 15 Midwest Industries Combat seven-sided M-LOK handguard. This complete system comes fully equipped with an enhanced reliability bolt carrier group and a Gemtech ETM flash hider, providing a premium suppressed-host solution for the AR-Platform. Note: The patented GVAC system utilizes a re-imagined barrel and gas block profile to manage pressure more efficiently, keeping excess carbon and gas out of the shooter's face when a silencer is attached.