A3 Flattop Upper Receiver Assembly

Calculated at Checkout
  • A3 Flattop Upper Receiver Assembly
  • A3 Flattop Upper Receiver Assembly


The Standard Manufacturing Co. STD-15 upper receiver, like the STD-15 lower receiver, is entirely manufactured in-house to the most exacting tolerances and to the highest quality control levels. The STD-15 upper begins with a 7075T6 aluminum forging and is machined on the very best aerospace machinery in the industry. At every step of the manufacturing process, each upper receiver is quality checked before continuing to the next operation. While other manufacturers outsource their uppers from a factory that manufactures hundreds if not thousands of upper receivers daily, at Standard Manufacturing, we manufacture our upper receivers one at a time. This is absolutely and positively the only way the very best upper can be made. If your next AR build requires the very best, the STD-15 upper receiver is your only option. The Standard Manufacturing upper and lower receiver combination will result in the ultimate platform for your AR build.


· 7075T6 aluminum forgings

· Rich black Type 3 Hardcoat Anodized finish


· Pivot and Takedown pin hole size is .250”

Currently only available in Right-Handed Option.

View AllClose

Warranty Information

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) SPECS:
View AllClose