The Phase 5 Weapon Systems A3 Flat Top Complete AR-15 Upper Receiver is a solid building block for your next AR.

  • Flat top upper receiver, complete.
  • Mil-spec type III hard coat anodizing
  • Precision machined to M16/M4 specs
  • M4 feedramps
  • Includes: Forward assist assembly, ejection port cover assembly.

Made in USA