MOA Customs Big Bore Upper Receiver


The MOA Customs upper is a Mil-Spec AR-15/M4 upper receiver milled from a 7075 T6 aluminum forging and finished in MIL-A-8625, type III, Class 2 black anodize coating.

In stock



Our MOA Customs upper receiver is milled from a 7075 T6 aluminum to Mil-Spec dimensions and tolerances.  This allows the receiver to accept Mil-Spec parts and mate with Mil-Spec lower receivers.  After Mil Spec anodization, we add a layer of black teflon to ensure color consistency, provide additional protection, and give the part an easy to clean surface finish. Match this upper with a TTP lower receiver for an attractable and reliable platform for your next AR build.


  • Works with standard AR 15/M4/M16 components
  • M4 feed ramp
  • Port door opening has been enlarged to fit .458 SOCOM and other similar rounds (.450 Bushmaster, .50 Beowulf, etc.)
  • Compatible with AR15 port door and forward assist



  • Material: 7075 T6 Aluminum Forging
  • Coating: MIL-A-8625, type III, Class 2 black anodize with Teflon
  • Weight: 6.98 oz


Package includes:

  • MOA Customs stripped upper receiver

Additional information

Weight .5235 lbs
Dimensions 7.65 × 2.1 × 2.3 in


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