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CMMG Mk4 AR-15 Upper Receiver Assembly 55BA22C


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  • Model: 55BA22C
  • Shipping Weight: 0.75lbs
  • Manufactured by: CMMG

55BA22C CMMG Mk4 Upper Receiver Assembly

The 55BA22C from CMMG is a M4 flat top upper receiver and it is machined from a Mil-Spec 7075 T6 forging with a durable Type III Hardcoat Anodized finish that also features T-Markings along the top rail, M4 feed ramps cut into the receiver before Anodizing to avoid future reliability issues. We’ve also included a forward assist and ejection port door cover already installed in the upper for you!

55BA22C Detail Information

  • Built for Heavy-duty Use
  • Precision machined to correct Mil-Specs from 7075 T6 Forgings
  • Fully Assembled with forward assist, and ejection port cover
  • Mil-Std 1913 Rail for mounting optics and accessories
  • Machined for use with barrels that use an M4 barrel extension
  • T-markings for addressing the remounting of optics
  • Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
  • Type III Hard Coat Anodized
  • Made in the U.S.A.
  • Ejection port door cover and forward assist come pre-installed

CMMG Mk4 55BA22C Upper Receiver

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