A3 Flattop Upper Receiver Assembly

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  • A3 Flattop Upper Receiver Assembly
  • A3 Flattop Upper Receiver Assembly


Standard Manufacturing Co LLC makes these upper receivers in house on our state of the art machines from raw forgings. EDM machine completes the process to give us a "Built like a Tank" perfect upper receiver. They are made to proper Military Specification. It's a Flattop A3 Upper receiver with M4 Feed ramp cuts. The ejection port cover and forward assist installed. Picatinny rail on top for attachment of back up iron sights and/or optics. (Does not come with a bolt carrier group or charging handle)


Pivot/Takedown Pin Size: Small pin - .250"

Material: Forged 7075T6 Aluminum, mil-spec with type 3 hard coat anodizing , dry lube, and a picatinny rail on top

Currently only available in Right-Handed Option.

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