Griffin Armament MK1 AR-15 Assembled Upper Receiver

Upgrade your AR-15 build with the Griffin Armament MK1 Assembled Upper Receiver, a precision-crafted component designed for reliability and seamless integration. This mil-spec upper arrives ready for barrel installation, featuring a pre-installed forward assist and ejection port door to streamline your assembly process and deliver professional-grade performance from the start.

Key Features

• Forged 7075-T6 aluminum construction provides exceptional strength and lightweight durability for demanding tactical applications.
• Mil-spec M16/M4 machining with M4 feedramps ensures compatibility with a wide range of barrels and reliable feeding in high-volume use.
• Pre-assembled forward assist and ejection port door saves time and reduces the need for additional tools or expertise during build.
• Type III hardcoat anodized finish in Black, Terra Brown, or Warhawk Green offers corrosion resistance and a professional appearance that matches various firearm aesthetics.

Specifications

• Material: 7075-T6 Aluminum
• Finish: Mil-A-8625F, Type III, Class 2 Anodized
• Weight: 8.5 oz
• Feedramps: M4
• Assembly: Includes forward assist and ejection port door

Why Choose This Product

Builders seeking a dependable foundation for their AR-15 appreciate the MK1’s exacting tolerances and thermal-fit barrel extension compatibility, which promotes consistent accuracy and longevity. Its forged design withstands rigorous use while maintaining mil-spec standards for drop-in compatibility with standard lowers and components. Whether completing a custom build or replacing an existing upper, this receiver addresses common pain points like assembly complexity and finish quality without unnecessary extras.