Yankee Hill Machine A3 Upper Receiver Assembly – AR-15 Platform

The Yankee Hill Machine A3 Upper Receiver Assembly is a forged aluminum stripped upper designed for AR-15 platform builds. This flat-top configuration features a full-length MIL-STD-1913 Picatinny rail for optics and accessories, making it compatible with standard AR-15 lower receivers in 5.56 NATO/.223 Rem and other calibers using the AR-15 platform.

Machined from 7075-T6 aluminum forgings with a black hard-coat anodized finish for corrosion resistance and durability. The receiver shell includes the ejection port cover assembly and forward assist assembly installed. Index marks are present for proper barrel nut timing. Requires a barrel, barrel nut, handguard, bolt carrier group, and charging handle to complete (not included). Installation requires standard AR-15 armorer's tools and torque wrench.

• Platform: AR-15
• Type: Stripped upper receiver assembly
• Material: 7075-T6 forged aluminum
• Finish: Black hard-coat anodized
• Rail: Full-length MIL-STD-1913 Picatinny
• Includes: Ejection port cover assembly, forward assist assembly
• Installation: Requires barrel assembly, BCG, charging handle, and armorer's tools