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Phase 5 A3 Flat Top Complete AR-15 Upper Receiver

Phase 5

  • 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

  • Item Specifications
  • The MSR Arms Advisor articles are intended to answer some of the most common shooter questions and assist our customers in making the best purchasing decision possible.
  • No questions have been submitted regarding this product. If you have a question regarding this, or any of our other products, please submit them by emailing sales@msrarms.com. We will return your email promptly and post both the question and answer here for our other customers to view. Remember, there are no dumb questions... Thank you, MSR Arms

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