Yankee Hill Machine MR7 Upper Receiver Features The Yankee Hill Machine MR7 Upper Receiver Group is a complete upper assembly chambered in 5.56mm built around a 16 4150 chrome moly vanadium barrel with a 1:8 twist for consistent accuracy across standard 5.56mm bullet weights. The forged 7075-T6 flat top upper receiver features M4 feed ramps and T-marks giving the assembly the same durable foundation found on Yankee Hill Machine's complete rifles. Because the upper is a complete ready-to-install unit it drops onto any compatible AR-15 pattern lower receiver without requiring the purchaser to go through an additional transfer. The YHM low profile gas block keeps the gas system compact and unobtrusive under the handguard. For AR builders who want a factory-correct upper assembly without extra gunsmithing the MR7 Upper Receiver Group's barrel and receiver combination deliver. The MR7 Mid-Length M-LOK handguard bridges the upper receiver and gives builders room to mount lights optics or other accessories along a free float rail. A YHM Phantom 5C2 flash hider/compensator manages muzzle rise and flash and the flat-top Picatinny rail standard to AR upper receivers provides a continuous optics mounting platform right out of the box. At approximately 4.1 lbs. the upper stays light enough to keep a build balanced and easy to handle. Swapping complete uppers is one of the most popular ways AR-15 owners expand their rifle's capability letting a single lower serve multiple roles from range plinking to home defense. For AR owners who want to add a second configuration to an existing lower without a new serialized receiver this upper assembly delivers. Yankee Hill Machine has built a strong reputation in the AR accessory and component market for reliable well-machined parts. An upper receiver group like this one gives builders a dependable name-brand foundation to assemble around. The Yankee Hill Machine MR7 Upper Receiver Group is available for sale at GrabAGun for AR owners and builders wanting a quality 5.56mm upper. Yankee Hill Machine MR7 Upper Receiver Specifications Manufacturer: Yankee Hill Machine Company Model: MR7 Upper Receiver Caliber: 5.56mm Barrel Length: 16 Barrel Material: 4150 Chrome Moly Vanadium Rate of Twist: 1:8 Receiver: Forged 7075-T6 Flat Top M4 Feed Ramps T-Marked Handguard: MR7 Mid-Length M-LOK Muzzle Device: YHM Phantom 5C2 Flash Hider/Compensator Gas System: YHM Low Profile Gas Block Weight: Approximately 4.1 lbs. Available At: GrabAGun