Experience a new level of suppressed shooting with the Gemtech GVAC Upper Receiver in 5.56 NATO. This advanced system is engineered to minimize gas blowback delivering a smoother shooting experience with its innovative design. The upper receiver is crafted from durable 7075-T6 aluminum featuring a Mil-Spec build with indexing marks and M4 feed ramps. The barrel is made from resilient 4150 CMV steel stress-relieved and Armornite treated with a 1:8 twist 5R rifling for superior accuracy. The GVAC profile and Nickel Boron coated barrel extension ensure high performance and durability. Equipped with a mid-length GVAC direct impingement gas system and a pinned low-profile gas block this setup is optimized for reliability. The Gemtech ETM flash hider constructed from 4140 CM steel completes the muzzle device. The bolt carrier group is made from high-quality Carpenter 158 steel with a chrome-lined properly staked gas key for enhanced reliability. Complementing the system is a 15-inch Midwest Industries Combat M-LOK free-float handguard providing a robust platform with seven-sided M-LOK attachment points integrated QD sling sockets and a continuous Picatinny top rail. Crafted from 6061-T6 aluminum with a Type III hard coat anodized finish the handguard is as sturdy as it is versatile. Redefine your shooting experience with the precision and performance of the GVAC system.