Rosco Mfg Purebred Upper Receiver - Gorilla Arms LLC

Rosco Mfg Purebred Upper Receiver


Rosco stripped upper receivers are designed to work perfectly with their barrels. Every possible option went under the microscope for these uppers in order to tighten the tolerances for the purposes of enhanced accuracy and reliability. They teamed up with their OEM partner American Defense Mfg. and asked them to create the perfect upper that would fully compliment the features of their barrels. The result is a billet receiver that was built to take continued abuse while providing amazing accuracy.


  • Upper Receiver comes with the Forward Assist and Ejection Port Cover installed.
  • Hard Coat Anodized per Mil-A-8625F, Type III, Class2.
  • Precision machined from 7075-T6.
  • M4 Feed ramps.
  • Weight- 9.4 oz.

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